What Do Snails Eat? Wild, Aquarium and Pond Diets

There are lots of questions about snails, including how long snails sleep and what to feed them. The answer depends on the kind of snail.

Freshwater snails eat algae, biofilm, decaying plants, leftover fish food and blanched vegetables such as zucchini, cucumber and kale. A planted tank with some algae usually covers most of their needs. Add a calcium source and a sinking wafer or two, and remove uneaten vegetables after about 24 hours. Carnivorous snails like assassin snails eat other snails, bloodworms and sinking protein foods.

What Do Freshwater Snails Eat? Quick Guide

What Do Snails Eat In The Wild?

Snails and slugs are gastropods, part of the phylum Mollusca. They share a muscular foot, and most have a shell.

They feed with a radula, a tongue-like ribbon of tiny teeth that scrapes up plant material, algae or prey. Different snails use it in different ways.

Land snails usually feed at night and on wet, overcast days. Most eat vegetation and are known garden pests, going for seedlings, fruit, vegetables and flowers. They also eat dead plant and animal material, which makes them decomposers in natural food cycles.

Aquatic snails graze on algae growing on rocks and sediment, and on submerged and floating plants. A few are carnivores that eat worms, insects, small crustaceans and other snails.

What Do Sea Snails Eat?

Sea snails include limpets, abalones, whelks and cone snails. Most are algae grazers that scrape algae from rocks and reefs. Abalones, limpets and cowries are examples.

Others eat dead plant and animal matter, or hunt. Predatory sea snails such as tritons, whelks and cone snails eat other invertebrates. Tritons are one of the few predators of the crown-of-thorns starfish, which damages coral reefs. Oyster drills use their radula to bore through oyster shells, and moon snails will even eat each other. Some cone snails carry venom that can be dangerous to humans, so never handle them.

In a marine aquarium, algae-grazing snails need algae, algae tablets and a calcium source. Carnivorous snails need meaty foods such as clams, brine shrimp or smaller snails.

What Do Freshwater Aquarium Snails Eat?

Most common aquarium snails are freshwater species, including nerites and mystery snails (a type of apple snail). Most are grazers and algae eaters. They also eat biofilm, detritus, dead leaves and leftover fish food. Very few are carnivorous.

How do you feed freshwater snails?

In a mature tank with algae and plants, snails often need little or no extra food. If the tank is very clean or newly set up, supplement:

• Algae wafers or sinking pellets, a few times a week.
• Blanched zucchini, cucumber, kale, spinach or lettuce. Boil briefly (about two minutes) and cool to soften it. Remove what’s left after about 24 hours, since rotting vegetables foul the water.
• Floating or submerged plants such as anacharis and water lettuce, which snails will graze.
• Commercial snail foods, which are often fortified with calcium.

Mystery snails in particular can eat more than you’d expect, so watch portions and water quality.

Do snails need calcium?

Yes. Snails build and repair their shells from calcium, and thin, pitted, cracked or eroded shells usually point to too little calcium or water that is too soft or acidic. Nerites and mystery snails do best with pH above about 7.0 to 7.2 and moderate to hard water. Give calcium-rich foods or a snail mineral supplement, or use cuttlebone, crushed coral or crushed eggshell.

What do carnivorous snails eat?

Assassin snails eat other snails, and will also eat carrion, fish eggs and newborn fry. When snails run short they will accept frozen bloodworms, sinking wafers and pellets. They go after mystery, nerite and other larger snails, but are reported to leave their own kind alone. They are generally safe with peaceful fish, plants and dwarf shrimp.

Can snails live on leftover fish food?

They will eat leftovers, but that’s rarely enough on its own. Don’t overfeed the fish to feed the snails; leftover food decays and spikes ammonia. Sinking wafers that your fish ignore are a better way to feed snails.

Is copper safe for snails?

No. Snails are sensitive to copper-based medications and to salt. Remove snails before treating the tank with these, and check the ingredient list of fish foods and plant fertilizers.

What Do Pond Snails Eat?

Pond snails eat algae, plants, decaying matter and particles in the water. In a pond with plenty of vegetation, they feed themselves.

Good plants include water hyacinth, water lettuce, bladderwort, duckweed and anacharis. They will also take lettuce, cucumber, zucchini and kale as a supplement. Carnivorous pond snails eat insects, insect larvae, worms and other snails.

In warm weather snails feed more, so offer algae tablets or vegetables if the pond is short on plants. As temperatures drop, they eat less and may go dormant.

What Do Nerite, Apple and Mystery Snails Eat?

What do nerite snails eat?

Nerite snails are among the best algae cleaners, including hard-to-remove green spot algae. They eat algae, biofilm, leftover food and decaying leaves, and leave healthy plants alone. If the tank lacks algae, offer algae wafers or blanched zucchini.

What do apple snails eat?

Apple snails have big appetites. Many eat living and dead plants as well as algae, so some species damage planted tanks and rice or taro crops. They are native to South America and have become invasive in some US states and parts of Asia after aquarium releases. Never release aquarium snails into the wild.

What do mystery snails eat?

Mystery snails eat algae, biofilm, fish food, dead plants and dead fish. They generally leave healthy aquarium plants alone, but may nibble sick leaves and small floating plants such as duckweed. They need plenty of calcium and minerals. Offer blanched greens, sinking pellets and shell supplements.

What do baby snails eat?

Newly hatched snails eat microscopic algae and biofilm, then the same foods as adults. They do well on blanched lettuce or kale and algae wafers, and need a steady calcium supply to build a strong shell. Young snails need food more often than adults.

Frequently Asked Questions

What do freshwater snails eat in an aquarium?

Algae, biofilm, decaying plants and leftover fish food make up most of the diet. You can add algae wafers, sinking pellets and blanched vegetables like zucchini or cucumber when natural food runs short.

How do you know when a snail is hungry?

Look at the tank rather than the snail. If the algae and biofilm are gone, because the tank is very clean or newly set up, your snails need extra food. Offer an algae wafer or blanched vegetable a few times a week and remove leftovers after about 24 hours. In a mature, algae-rich tank they may need nothing extra.

Can mystery snails live alone?

Yes. Mystery snails do not need a companion to stay healthy, and a single snail can live well in an appropriately sized tank. They have separate sexes, so you need a male and a female if you want eggs.

Will snails eat my aquarium plants?

It depends on the species. Nerite snails and mystery snails mostly eat dead or unhealthy plant material, though mystery snails may nibble duckweed. Many other apple snails will eat healthy plants.

Can snails eat fish food?

Yes. Sinking wafers and pellets work best, because flakes disappear before snails reach them. Make sure the food does not contain copper.

How do I give my snails calcium?

Use a snail mineral supplement, calcium-rich pellets, cuttlebone or crushed coral. Hard, alkaline water also helps shells stay strong.

Summary

Snails are easy to feed. Most freshwater species graze on algae and biofilm, and a few extras cover the rest. Add calcium, avoid copper, and clear uneaten food, and they make a useful tank clean-up crew.