I assume they are eating land snails, right??? Or would they be able to snare Apples who go out of the water to lay? I would think the Operculum (is that spelt right?) would keep them out??
I know, you probably don't know the answers to these, just wanted to post them
Currently running 9 tanks, 3 x 20g, 26g, 2 x 40g, 2 x 55g and 125g