I had a RBTA in my 30 long. It was beautiful, but one day it decided to move. There was nothing I could do about it. Then it split. Then they would both move. Ultimately they went to a new home with WAMAS members. I miss them in the tank but for my situation it was way too much to worry about. For me I would probably only do one again with a massive tank or a nem only tank, and probably the latter. I think a nice nem cube attached to a preexisting system would be cool. Best of luck!