i have one tank that is a saltwater pred tank. i had quite a lot of fish in there but they have been going fast. i added a blue line grouper to my tank yesterday and my panther has been beating his ass. he wont leave him be at all. they are both about the same size and the lady at the pet store said they would be fine. can groupers even really be kept togeather? i dont know a whole lot about salt water fish. i just take the ladies word for it. please help. should i return the blue line or is this like cichlids where they will just esatblish a pecking order and be alright?
