I'm on my 4th small tig. The one I currently have seems to be ok. I do a 20% water change every other day. I feed about 40 rosies. he seems to eat what he wants. When they are gone I wait a couple days and feed some more. I keep the filter suction clean of dead rosies. Seems to be working. I agree with EKen53 my next one will be bigger. Every lfs around me has 1 or 2 of them 5" and all about $200 minus dickering.wonder if they are captive bread?