I went against my better judgment and put my Dovii in my community tank... he is the biggest fish at about 8"... so far he has taken over, but has not tried to kill anyone... except maybe my lil Festae... she grows so dang slow, all the other fish are now way bigger than her and the gap just keeps getting wider!! The Festae is only 3" (still!!) and I think the Dovii will see her as food... all the other fish are in the 5-7" range. He looks at the catfish like "what the heck are you", but has not done any damage or anything. The vulture cat actually went after him once, lol... not smart tho. Anyway, I've always wanted to keep a Dovii long term and this time I think I will!!!