I understand the water quality issues everybody has mentioned. The way I've got the 10 gallon tanks setup is I have a row of 10 10 gallon tanks that are hooked up to a 150 gallon tank that serves as a sump. I do two 25% water changes a week on all the tanks and I've never had any problems with water quality. But mainly what I was asking is, in a two week time period shouldn't the catfish grow at least a little bit? I don't understand it. This is my first redtail cat and I've heard from many people their growth rate is something like an inch a week. I've kept a few TSN's before and they grew like crazy, so I was expecting the same out of the RTC.