I've got 3 Rio Meta orinos all about 3" long. Had them for about a month now, when i got them thay all swam together, now they have each claimed a spot in the tank (125 growout), and have become real aggressive towards each other. Is this normal? One is beat up pretty bad, two have lost thier color and one is lookin great. Just wondering if this is normal behavior, any help would be great, thanks guys.