The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
I don't want to be a downer at all, but channel catfish have been known to outgrow a 100 gallon tank within a year. So, I don't think it will do well in a 27 gallon, especially a hex. If you just have to have this fish, then do not add any other fish.