So I have a Miniatus grouper and a Clown Grouper and they have gotten along for awhile with no issues, but this week I have noticed the Miniatus is picking on the Clown. He will dart out of the rocks and nip at his tail and go back in and hide. There is a ton of cover in the tank and no reason that I can think of that they should fight. I have heard of people using mirrors to calm aggression what do you guys think of this idea? Has anyone had luck with the mirror trick? Does someone have a link to one that sticks on with a magnet or suction cups? I really do not want to get rid of either of these fish, but we will see.