hey so i have a 6inch mbu in a 180g with 7 rainbow fish ,4 torpedo barbs and 6 scissor tail and 7 sword tails . my mbu been fine . but then the last week he is laying on the bottom and eating but half of what he always eats wich is clams and 2 prawn a day. im wondering maybe he does not like his tank mates. i had this problem with a fahaka once and moved fish out he was happy