I have an wolf fish upstairs but have to remove all tanks upstairs. He has his own 20 long and is about 5-6" long. I want to move him down to the 55g, but im afraid he will eat everything, as he even bites me when i do water changes In my 55g are 3 4" Dats, cories, plecos, a blue gularis, a few rainbow fish and a pair of swords. Im really only worried about the dats, gularis and plecos, what do you think?