Yeah those places you mentioned are where mine eat too. The snails I have seen honestly eat it off the plants are the pest snails. That is why a lot of people like them.I have had a nerite snail for a mounth now and everything is going well. He is eating algae off the wood, rock and glass. but not the java moss that not have some hair algae on it. So my question is does nerite snails eat algae off java moss or it it only shrimp?