What is your opinion? Any and all welcome. I have a 20g tank that has been emptied of fish, but it has a colony of MTS. Out of all the pest snails, I actually like MTS so I can make my sand deeper for plants knowing they will sift it preventing gas bubbles. I have been trying to decide what to do with these little guys so the tank has been running without fish for weeks now. I have MTS in other tanks, but my 55 seems to be lacking them. Should I move the sand full of them over, pick out a few and toss in, or just clean out the whole tank snails and all?