All posts regarding the care and breeding of catfishes from other parts of the world (North America, Europe and Australia). If you don't know where your catfish is from, post a query in the identification category.
This does not belong in the "Other catfish". Maybe "Tank Talk"?
Suggestion: go to Cat-eLog and find a catfish that is the right size for your tank in the second paragraph "Species Information", first line. The length given is the max known, reliable length for that fish in SL (i.e., lacking the tail). Then press one of the three options: "Find near, nearer or same sized spp." This filters the entire Cat-eLog for you! Browse the lists and see what you like, then check the entire page for your candidates paying particular attention to the tank water conditions you are looking to provide your fish with. Then check local availability.
Or start with availability, as many experts suggest, as your first step and then check for the fish's sizes and conditions you have to provide - i.e., Cat-eLog.
Judging from your nickname and the requests for a "large" catfish ideas, you should define what you mean. If you are thinking an RTC - forget it, a 2-footer, then it is still a no. If you are thinking one-footer TL (total length, not SL), it's a "maybe" but even then rather "hardly". Depends on the body mass too and other things. As Racoll says your tank should be 4 times longer and 2 times wider than your fish - rule of thumb. For some actively swimmers, like irridescent sharks, you need even larger quarters, for others, like some pseudopimelodidae, a bit less will still work.