Why would a rabbit snail crawl straight past blanched zucchini, a cube of Repashy and an algae pellet? Most often because it’s already fed. Rabbit snails (Tylomelania sp.) are grazers that rasp the thin film of algae and biofilm off rock, wood and glass, and in a mature warm tank that film is the meal. Prepared food is a top-up, so a snail with a well grazed tank under it has no reason to hurry over to a pellet. That habit is why a refused pellet says so little, and it’s laid out in what rabbit snails eat.

How to tell your rabbit snail is grazing when you never see it eat

Look for the meal, not the mouth: a snail that moves overnight and leaves clean tracks through the film is eating. Most “won’t eat” reports turn out to be “won’t eat the thing I put in”. A feeding rabbit snail looks like almost nothing is happening. The long snout sweeps the surface in front of it and the shell creeps along, with none of the dash a shrimp makes for a pellet. Sulawesi Keepers, the conservation group that works with these snails, describes the hard surface species as feeding on the biofilm they take off stones, glass and other smooth surfaces. That’s keeper guidance from a specialist group, not a study.¹

So how do you check? Two looks give you most of the answer.

Note where the snail sits at lights out and look again in the morning. If it has moved, it has been working.
Shine a flashlight along the glass and the rock at a low angle. Clean, winding paths through the film are grazing tracks.
Don’t judge it by whether the food disappeared overnight. Shrimp, other snails and the filter account for most of that.

Why a newly arrived rabbit snail may ignore food for weeks

A rabbit snail that’s just been shipped may stay withdrawn in its shell for a while before it starts moving around the tank, and that’s the commonest reason a new one eats nothing you offer. Treat an exact number of days from anyone as a guess. Keep the tank boring instead: steady temperature, no chasing the numbers up and down, modest light, and no pile of food waiting on the sand.

We know you want to tempt it with something. We’d wait. Food left in a tank this warm breaks down quickly, and a shut snail is a much smaller problem than the water you get from overfeeding one that isn’t eating.

If your snail was imported and stays still long after the others are moving, look its shell over for small leeches. Leeches that arrive on imported rabbit snails harm the snail, and keepers who find them take them off. One keeper noticed that the inactive snails in a new import were the ones carrying leeches, and came to believe the leeches had weakened them to the point they couldn’t eat.

Check your Sulawesi tank’s water before you blame the food

Rabbit snails need the same warm, alkaline, mineral rich water as Sulawesi shrimp, so test that before you change a single food. The numbers for that water, and how to hold them, are in Sulawesi rabbit snail care. A tank that has drifted out of it explains a shut snail far better than fussiness does. Test first, then move one value at a time. These are the numbers we keep to.

Water values for rabbit snails (*Tylomelania* sp.)
Temperature	79-86°F (26-30°C)
pH	7.5-8.5
GH	4-8 dGH
KH	3-6 dKH
TDS	150-250 ppm
Nitrate	Under 10 ppm as a working target, not a tolerance limit
Ammonia and nitrite	Zero, in a cycled and mature tank

Then ask a harder question: has anything copper bearing gone into this tank? Elevated copper is toxic in fresh water and can harm invertebrates. The US Environmental Protection Agency describes acute exposure as killing animals outright, and longer exposure as cutting survival, reproduction and growth.² That covers a lot of ordinary bottles: fish medications, some plant fertilizers, algaecides and snail treatments. Read the label of everything you’ve dosed in the past month. No one has published a safe copper level for these snails, so the honest answer is none at all.

Before you add anything

Don’t treat a snail that won’t eat with a medication. There’s no diagnosis here yet, and invertebrate safe dosing for this animal isn’t documented. Fix the water, wait, and ask a qualified aquatic vet if the animal is clearly declining.

Grow enough film on the rock and glass to feed a rabbit snail

Run a tank that grows a grazing layer faster than the snail strips it. That’s the real fix, and it’s slower than buying another food. It means plenty of hard surface, inert rock and sand with no pH lowering soil, and enough light hours for a soft film to build. A young tank with clean glass and bare stone has nothing in it for a grazer, and no amount of zucchini makes up for that. The same goes for whether rabbit snails eat fish food: it can round out a meal, but it never grows the film your snail lives on.

It helps to say plainly what these snails don’t do. Sulawesi Keepers states that green filamentous algae are definitely not their natural food. It also says heavy algae growth is a nuisance, because it blocks access to the surfaces the snails want.¹ So a rabbit snail isn’t a cleanup crew. If you bought one to clear hair algae, that’s the disappointment talking, not a sick animal.

Stocking matters here too. An adult rabbit snail is a large grazer, and it counts against the same film your shrimp are working on. A tank that supported a colony just fine may go thin once two or three snails join it. Snails sharing one film also raises the question of whether rabbit snails eat other snails, and the answer there is about scavenging, not hunting. If you’re still deciding what to add, our Sulawesi rabbit snails are bred in our own tanks, and we’d put one into a system that already carries a visible film.

Put Repashy, vegetables and pellets where a rabbit snail can rasp them

Change the presentation before you change the brand, because a radula works by scraping against something that holds still. Where these snails graze turns out to be part of what they are. In one Lake Towuti species, snails living on rock and snails living on submerged wood have measurably different feeding organs: 79 percent of the snails found on rock were the rock form, and every snail found on wood was the wood form.³ That study measured the feeding organ and the genes behind it, not stomach contents, so read it as evidence that surface matters to this animal. It isn’t a menu.

Mix gel food thick and press it onto a stone, a piece of slate or a branch of wood before it sets, then put that piece back in the tank. A cube sitting loose on sand rolls away from a snail trying to rasp it.
Give vegetables a day in the water before you write them off. A slice that’s still firm on the first evening is often taken once it has softened, so leave it overnight and lift whatever is left the next morning.
Feed after the lights go out. Put the food near where the snail already sits, not in the open middle of the tank.
Take out whatever is left the next morning, every time.

At Shrimp Aquatics, mature algae and biofilm do most of the feeding in our Sulawesi systems. We normally offer prepared food only about once a week and remove the leftovers. Part of the reason is that many of the animals in these systems show limited interest in it. The rest is that food sitting in warm water adds organic waste, and it can raise ammonia, nitrite and nitrate as it breaks down. If you’re feeding a rabbit snail daily and it keeps refusing, once a week is a better starting point than a new product.

One honest caveat. Treat every recommended food list you read, ours included, as something to try. It isn’t a requirement your snail is failing to meet.

When a rabbit snail that stops eating is worth worrying about

Refusing prepared food on its own isn’t a symptom. So when is it actually a problem? When it arrives with company. Work through these, in this order.

The snail hasn’t moved at all over several days and doesn’t pull in when you touch the shell edge.
Your test kit shows any ammonia or nitrite, or the temperature, pH, GH, KH or TDS has drifted off the values above.
The newest shell growth at the opening looks pitted or chalky. A worn, scarred tip on an old shell is a different thing, and common in adults.
Something copper bearing has gone into the tank, or the snail came from a tank that was treated.

If any of those is true, deal with the water first. Test, then do a small water change with water matched to the tank for temperature and chemistry, and hold everything steady for a week. If the animal is clearly declining, a qualified aquatic vet or a local specialist is the right call, and a care article isn’t. You can also email us at contact@shrimpaquatics.com with your pH, GH, KH, TDS, temperature, tank size, cycle status and current livestock, and we’ll tell you what we’d check next.