Hmm, well, my tanks are well-covered, there are sponges on my intakes,I don't have a powerhead, I feed all of my tanks fresh veggies and algae discs, and my ph is 7.4, so theoretically I have a good tank for snails? I just seem to have no luck with them. The first one that died was my fault, but the second one was just a weird accident. Maybe it's a sign?