I want to get a big catfish (not too big) for my 90 gallon tank. I want a fast grower, not too aggressive, and one that is fairly active. any suggestions?
Depending on what other fish you have in the tank, you could get some synodontis catfish. Some like to be in groups, and some are loners. Some do better in low pH and others in high pH. Most are not aggressive. Check them out on www.planetcatfish.com