VOLCOMMIKE said:
IF I WERE YOU ID BUY A NICE and not aggresive catfish
If
I were you, I'd listen to some of the advice given!
I don't mean to be harsh (I fell for the lure of the Biorb too!), but it is not the fault of your fish that your tank isn't suitable, so don't take it out on them! :sad: You are responsible, and you need to sort this situation out. Either take some fish back to the LFS/given them away (to responsible fish keepers), or go out and get a tank large enough for what you want to keep.
As I said, I have a Biorb too, a 30L. I had planned to have a couple of fancy goldfish, until I discovered it was way too small. Sure, I was disappointed. But I now have white clouds in there, and while I understand if people think they aren't very exciting, I really rather like them. And I doubt I would ever have discovered that, if I had ploughed ahead and got goldfish and then stressed fish started dropping dead all over the place. My interest would have been lost very quickly.
If you don't appreciate the wildlife you have, then move them on to a better place. It's in all your best interests.