Check this out.
Did not think they came so big.
Imagine the size of aquarium you would need.
https://ca.news.yahoo.com/blogs/daily-buzz/what-a-catch--italian-fishermen-reel-in-280-pound-catfish-174655876.html (https://ca.news.yahoo.com/blogs/daily-buzz/what-a-catch--italian-fishermen-reel-in-280-pound-catfish-174655876.html)
That's a huge fish!
I have seen displays of Red Tail Catfish where the fish is about 4 feet long. In one case this was in a professional aquarium, and a beautiful display. In another case it was someones private aquarium where the tank was slightly longer than the fish, a miserable existence for such a stunning fish.