i stumboled apon a wels in a local contry max . well i was not ready for this fish ,it ate all the fish in the tank i 3 days and grew an intch a week every weel until i found a new home for it. im not saying dont get it just be ready.
Wels Catfish would need an extremely large tank. I wouldnt even consider it unless you were putting it into a good sized pond. Havent you seen "River Monsters".
Yeah man i don't know either but i feel bad that no one could answer you and just said "YOU NEED A POND" "YOU NEED A LARGE TANK/HAVENT YOU SEEN RIVER MONSTERS!!!!!!"
Don't worry about it just know they get real big. Send a pm to fugupuff. See what he says he seems to always get crazy stuff in.