Report Snails in The Community Tank Posted June 13, 2013 Others might have other experience, but I find that the majority of my adult males like to attack larger snails like mystery snails when they have their eyestalks out - a bit of a temptation with them looking like live worms wiggling around. Mystery snails are, however good for cleaning up spawn tanks and most fry will leave them alone. May I ask what you are getting the snails for? Try and stay away from some of the common smaller pest snails like the common pond snail, they breed far too quickly and are hard to remove from a tank once infested. If you have plants in the tank, make sure you don't get a snail that eats plants I've had Ramshorn snails in with bettas before without problem. They can breed quite rapidly too, so you need to be on the lookout for eggs before they hatch and take over in plague proportions.