So I have a Midas blenny and a royal gramma in my tank. Midas is the king of the tank. He was added second. Over the past week or two, he’s been stealing the royal grammas territory temporarily to Perch on and then swims out. The royal gramma used to open his mouth and kick him out but he’s kinda given up. He doesn’t sleep there and they both sleep in their territories. Is this a problem to be concerned about or is this a normal behavior?