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If given no choice, all snails will eat plants. So will you. Apple snails even eat sponge filters. Trapdoor snails are not quite as voracious. But put a dozen in a 10-gallon tank with no food and theyâll eat filters, too. They much prefer fish food. In the absence of fish food, they will eat algae AND plants.
The ones that we are primarily concerned about are the keyhole and slit limpets. These are limpet-shaped snails with a perforation on the top of the shell (keyhole limpets) or a slit on the front shell margins (slit limpets).These animals are generally carnivorous, and will eat sponges, soft corals, and other sessile animals.hese limpets are exceptionally well equipped to eat these algae. They have a radula with teeth made of a mixture of iron salts (primarily hematite) and silica (in the form of opal). This gives them a rasping organ with a value of 7 or 8 on the Mohs scale of mineral hardness.