Common Sulawesi Shrimp Care Mistakes and What to Do Instead

Sulawesi colony struggling and nothing looks obviously wrong? The cause usually traces back to a short list of decisions made before the shrimp ever arrived: an active soil working against the pH, mineral that never fully dissolved, a tank that finished its nitrogen cycle but has nothing growing on the rock yet, or a maintenance routine carried over from a Neocaridina tank. Sulawesi shrimp are demanding, but every one of those is visible and fixable. This guide works through the mistakes roughly in the order they happen, so you can find the one your own tank is making.

Why a Bee shrimp routine kills Sulawesi shrimp

Because Sulawesi lake Caridina need the reverse of Bee water: Crystal Red and Taiwan Bee lines are kept cool, soft and acidic, and the two kinds of water can’t be blended or averaged. Arriving with a Caridina routine that already works in another tank is a common way to start badly.

The shrimp in this group come from the ancient lakes of Sulawesi, and individual species are often restricted to a single lake. The cardinal shrimp, Caridina dennerli, is endemic to Lake Matano and widely distributed within it, and Caridina glaubrechti is endemic to Lake Towuti.¹ Those lakes are unusually steady places. Lake Matano has been studied partly because of its minimal seasonal temperature variability,² and water temperatures in Lake Towuti sit around 82°F (28°C) all year.³ That’s the water these shrimp live in, and a tank that swings a few degrees between afternoon and dawn isn’t reproducing it.

Set the three groups side by side and the trouble with a borrowed routine is obvious.

Read down the last column and the practical requirements fall out of it. You need a heater that genuinely holds a setpoint, a carbonate reserve that nothing in the tank is quietly eating, and a system that doesn’t lurch when you touch it. Everything below is a way of protecting one of those three things.

Active soil and botanicals pull a Sulawesi tank out of range

Active soil fights the alkaline water Sulawesi shrimp need, because it’s built for the opposite job. Active and buffering soils exist to pull a Bee tank down to a low pH and hold it there. Alkalinity is the water’s buffering capacity, its ability to neutralize acids and keep the pH fairly stable, and it depends on dissolved bicarbonates, carbonates and hydroxides.⁴ A substrate whose whole purpose is to win an argument with that buffer isn’t a neutral choice under shrimp that need the buffer intact.

The standard setup for this group is inert substrate and inert hardscape, and an active pH-lowering substrate shouldn’t be the default under a Sulawesi tank. Sand, inert gravel and unreactive rock give you what you actually want from the bottom of the tank: surface area with no chemistry attached.

What about the botanicals you’re used to from soft water tanks? Driftwood, catappa leaves and alder cones go into those tanks on purpose, for what they put into the water. In a Bee tank that’s the point of them. In a tank whose stability depends on holding an alkaline pH, anything added for its effect on water chemistry needs a reason to be there, and here those items don’t have one.

Dissolve Sulawesi mineral fully before it reaches the tank

Mix and finish Sulawesi mineral in a separate container. It isn’t a scoop and stir product, and the manufacturer says so plainly. SaltyShrimp states that Sulawesi Mineral 8.5 requires additional measures to dissolve fully. With CO2 added at a regular quantity of about one bubble per second, the salt dissolves almost totally in approximately 3-4 days, and the water must then be aerated with an air stone for at least three hours to expel the CO2 before use. The same page gives the salt’s effect on hardness as a KH to dH ratio of 0.78 to 1.0. It also notes that less finicky Sulawesi species such as Caridina dennerli have been kept and bred with both Sulawesi Mineral 7.5 and Sulawesi Mineral 8.5.⁵

We know you’d like to pour it in and be done. Here’s what that page means for your own routine instead.

1. Mix and finish the water in a separate container, never in the tank. Cloudy water means part of the mineral hasn’t dissolved yet, so by the manufacturer’s own description the mix isn’t finished.
2. Take the reading that counts after the water has cleared and been aerated. A number measured while the mix is still hazy isn’t the number your shrimp will end up living in.

Those instructions describe the 8.5 formulation. Follow the current instructions for the product you actually bought, and check the finished pH, GH and TDS yourself.

Zero ammonia doesn’t mean a Sulawesi tank is ready for shrimp

Zero ammonia tells you the tank can process waste, and nothing about whether there’s anything on the rock worth eating. A fully cycled aquarium is the baseline for any shrimp, and for this group it’s only the baseline. Ammonia and nitrite at zero with an established biological filter is the chemistry side done. A tank that finished cycling a fortnight ago is chemically safe and nutritionally bare, a bit like a new kitchen with an empty fridge. Supplemental food can’t make up for a system that hasn’t matured.

What you’re waiting for is a mature, stable system with established grazing surfaces. That’s something you look at, not something you count off a calendar.

• Ammonia and nitrite both read zero on a fresh test, not on a test from last week.
• Temperature and chemistry have held across several days, not just for one good reading.
• The biological filter has been running long enough to be established, not merely installed.
• Rock and glass carry visible biofilm and algae instead of looking clean.
• A date on the calendar isn’t one of these checks and can’t stand in for them.

When the shrimp do arrive, follow the instructions on how long to acclimate Sulawesi shrimp supplied with that specific order, not a generic routine copied from another species, and don’t add transport water to the aquarium. Packing method, transit time and species all change what the right approach is on the day.

Why the cardinal shrimp’s conservation status should decide where you buy

Buy tank-bred stock, because the wild cardinal shrimp is Critically Endangered and may already be gone from the wild. Caridina dennerli, the animal most people mean when they say cardinal shrimp, was assessed for the IUCN Red List on 20 August 2018 as Critically Endangered. It was tagged Possibly Extinct in the Wild under criterion A2e, with a decreasing population trend and a native range confined to Sulawesi.⁶ That’s the state of the wild population, and it’s why sourcing isn’t a matter of preference for this group in particular.

Shrimp Aquatics breeds its own stock. The care level shown against each of our tank-bred Sulawesi shrimp tells you whether a line suits the tank you’ve actually built, not the one you’re hoping to build. Whoever you buy from, ask the same two questions before you order: where were the animals bred, and what water are they being kept in right now?

What adding fish costs a Sulawesi shrimp colony

Fish cost a Sulawesi colony its shrimplets and part of its food, even fish described as shrimp safe. The mistake is treating a Sulawesi tank as a display tank that happens to contain shrimp. A mixed setup only makes sense when every species in it overlaps in temperature, water chemistry, behavior, space and feeding opportunity. Sulawesi water at 79-86°F (26-30°C) and pH 7.5-8.5 rules out most common nano fish before behavior even comes into it. Bee and Crystal Caridina are ruled out by the same table you read earlier, for the same reason.

Even a fish described as generally shrimp safe will take shrimplets and sometimes adults. The honest version of that label is lower risk with adult shrimp, not safe for shrimplets, and the shrimplets are the generation that replaces the adults you already have. Anything else in the tank is also grazing the surfaces you spent weeks growing, so a tankmate that eats none of your shrimp is still competing for their food.

Sulawesi shrimp are peaceful and often shy, and how much you see of them varies a great deal with the environment you give them. If you still want company in the tank, weigh each candidate against the same five criteria.

Why the same trace ammonia is more dangerous at pH 8.5 than at pH 6.5

Because the toxic, un-ionized share of ammonia rises about tenfold for each one-unit rise in pH, so the same total reading holds roughly a hundred times more of it at pH 8.5 than at pH 6.5. Total ammonia in water sits in equilibrium between the ammonium ion and un-ionized ammonia, and it’s the un-ionized form that drives toxicity. High external un-ionized ammonia concentrations reduce or reverse diffusive gradients and cause ammonia to build up in internal tissues and blood. The split between the two forms is set by pH and temperature. The ratio of un-ionized ammonia to ammonium ion in fresh water increases roughly tenfold for each rise of a single pH unit, and by approximately two-fold for each rise of 10 degrees Celsius across the range from freezing to 30 degrees.⁷

So two pH units means about a hundred times more free ammonia in one identical total reading. And that’s before the warmer water is even counted. A trace reading a Neocaridina keeper would shrug at is worth acting on in a Sulawesi tank. It’s also why nitrate here is held to a target of under 10 ppm, tighter than the numbers used elsewhere in the hobby.

In practice, the waste load you control most directly is food, and food that goes uneaten in a warm alkaline tank is exactly the input this section is about.

So is prepared food the problem? No. It’s neither automatically refused nor automatically harmful. In a 2025 rearing trial on Caridina dennerli, the group given commercial pellets with a Hydrilla shelter gained the most length, an average of 0.119 cm over 30 days. It also recorded the highest survival of the four treatments at 72.727 percent, well ahead of the bacterial starter groups.⁸ Those figures describe that trial and not your tank, but they do settle whether prepared food belongs in a Sulawesi system. The failure is uneaten food breaking down in warm alkaline water, not the food itself.

How to keep oxygen up without pushing Sulawesi shrimp around

Keep the flow gentle at shrimp level and the surface moving, because warm water holds less oxygen. Cold water can hold more dissolved oxygen than warm water.⁹ A Sulawesi system runs near the top of the freshwater temperature range, so it begins with less oxygen in solution than the Bee tank beside it.

The mistake is solving two different problems with one knob. You see shy shrimp being blown off the rock, turn the flow down, and take away the surface movement that was putting oxygen back into the water. Those are separate requirements and they deserve separate answers: gentle movement down at shrimp level, strong gas exchange at the surface. Air-driven sponge filtration is one common way to separate them, and a powered return can be aimed to ripple the surface, not the rock. Whether either suits you still depends on tank size, bioload and the flow your system actually needs.

Judge the result in your own tank, and treat any change to flow as a change to two things at once.

Why TDS climbs in a Sulawesi tank between water changes

Because evaporation takes water out and leaves the dissolved solids behind. Top off with mineralized water and you stack more on top. Water leaves a warm open tank quickly, and evaporation concentrates dissolved solids in the water that remains.¹⁰ Refill that lost volume with remineralized water instead of pure RO and you add a second dose of mineral to water that’s already more concentrated than when you mixed it. Keep that up for a few months and the tank walks out of the TDS band of 150-250 ppm without a single event you could point to.

The fix is unglamorous. Replace evaporation with unmineralized RO water, and use fully prepared, temperature-matched and parameter-matched water only for water you deliberately removed. Take a reading before you add anything, because a measurement you never took is exactly how drift goes unnoticed for a season.

Why does a few ppm matter? Minerals aren’t cosmetic in this tank. In crustaceans, most of the calcium for a new shell comes from the water they live in.¹¹ Hardness that drifts is changing the conditions under which every shrimp in the tank has to rebuild its shell, and that isn’t something you get to watch until it goes wrong.

Running a Sulawesi tank hotter doesn’t speed anything up

A hotter tank won’t hurry growth or breeding. Pick a value inside 79-86°F (26-30°C) that your equipment can actually hold, and leave it there. Once a tank is finally stable, the next mistake tends to be a deliberate one. Growth looks slow, breeding hasn’t started, and the temperature dial is the easiest thing in the room to turn. We know the temptation.

The crustacean research doesn’t back it: in a controlled crab study, animals reared warmer molted more often but grew less at each molt.¹² That’s a crab, not a Sulawesi shrimp, so read it as a direction only. The working conclusion still holds. Steadiness is what this group rewards, and moving the setpoint to chase a result trades away the one thing that was going right.

What to check first when Sulawesi shrimp start dying

Start with the water temperature on a real thermometer, then work down the list below one item at a time. Losses in progress aren’t the moment for a redesign. Change one thing at a time, and write down what you find so the next reading means something.

1. Water temperature, measured with a thermometer, not read off the heater dial. A heater that has stuck on or failed off moves the tank out of the band in either direction.
2. Ammonia and nitrite. Anything above zero carries more weight here than the same reading would in a cooler, softer tank.
3. pH and KH together, never pH alone. A pH that has slipped below the band is a buffering question, and KH is the reading that describes the buffer.
4. TDS and GH, compared against your own previous readings as well as the range, so you can see which way they’re moving.
5. Everything that changed in the past week: new hardscape, a new food, a filter clean, an unusually large water change, or anything sprayed or dosed in the room.
6. Uneaten food and the state of the rock. Remove what’s sitting there, then look at the grazing surfaces, because food supply and water quality are separate questions and the rock is what answers the first one.

If the readings are inside the band and steady and the losses continue, stop adding things. This guide doesn’t diagnose disease, and exact medication or chemical doses aren’t something to work out from a care page. Speak to a qualified aquatic veterinarian or an experienced local specialist. Keep in mind that copper and some fish medications can harm shrimp and snails, so the actual formulation of anything you’re considering matters more than the label on the front.

What the research says about heat and minerals at the molt

The two studies behind the temperature and mineral advice look at crustaceans in general and at a crab, not at Sulawesi shrimp. Treat them as a direction, not a measurement of your tank. On minerals, the major source of the calcium a crustacean uses to calcify a new exoskeleton is exogenous, meaning it comes from the water it lives in, while diet and stored reserves contribute less.¹¹

On heat, a controlled study of the lesser blue crab found that animals reared under elevated temperatures showed a decreased intermolt period and decreased growth per molt. That produced smaller sizes at each instar. The authors add that if the pattern continued through the pubertal molt, elevated temperatures would result in smaller size at maturity.¹² More molts, less growth at each one. Since that’s a crab and not a Sulawesi shrimp, we’d read it as a reason to leave the heater alone and nothing more.

References

12 Sources

1. Radiation of endemic species flocks in ancient lakes: systematic revision of the freshwater shrimp Caridina from the ancient lakes of Sulawesi, Indonesia, with the description of eight new species, Raffles Bulletin of Zoology 57(2), Lee Kong Chian Natural History Museum, 2009.
2. The biogeochemistry of tropical lakes: a case study from Lake Matano, Indonesia (repository record and abstract), Limnology and Oceanography 53(1), 2008.
3. Geomicrobiological features of ferruginous sediments from Lake Towuti, Indonesia, Frontiers in Microbiology 7, article 1007, 2016.
4. Alkalinity and Water, U.S. Geological Survey Water Science School, updated August 24, 2026.
5. Sulawesi Mineral 8,5, minerals and trace elements, SaltyShrimp product information page, accessed September 5, 2026.
6. Caridina dennerli, IUCN Red List assessment, IUCN Red List of Threatened Species, assessed 20 August 2018.
7. Aquatic Life Ambient Water Quality Criteria for Ammonia, Freshwater, U.S. Environmental Protection Agency, Office of Water, April 2013.
8. Effect of using different shelter and feed types on growth and survival rate of Sulawesi endemic ornamental shrimps (Caridina dennerli), journal PDF, Jurnal Ilmiah PLATAX 13(1), 2025.
9. Dissolved Oxygen and Water, U.S. Geological Survey Water Science School, updated August 24, 2026.
10. Chloride, Salinity, and Dissolved Solids, U.S. Geological Survey Water Resources Mission Area, March 1, 2019.
11. Biomineralizations: insights and prospects from crustaceans, ZooKeys 176, 2012.
12. Elevated temperature induces a decrease in intermolt period and growth per molt in the lesser blue crab Callinectes similis (abstract), Journal of Crustacean Biology 39(1), 2019.