I already have 5 clown loaches in my 75 gallon. They are about 3 inches and I do not want to put them in a little 29 gallon nor do I want to separate them. That is why I asked if I bought one if it would do the trick. I have tried to siphon them out with a water change, but I do believe they can reproduce on their own. They might be natures cleaners, but they also like to nibble on my plants. I believe copper will kill them, but copper is not good for plants either. As far as the lime theory out there, I have never heard of it. I think I might try just getting a clown loach and letting him do the trick. Thanks to all.