Ive got 5 discus in a 55g tank and im having a problem with one of them... There is a main discus that thinks he is king of the tank and i added a snakeskin around a month or so ago and since i have put him in there all he has is been picked on by the king every time he goes to come out from hiding he is chased back in there... They are roughly round the same size what could i do to get them to get along?