so I have a male blue thought trigger about 4" long fat and healthy. he gets feed 2x a day with my 5 tangs (2x yellow, purple, sail fin, scopes) there in a 150g display and for the last couple of days every once in a while he goes NUTS does a half a lap to a full lap swimming full speed at the top of the tank making all kinds of splashing noise then jets to the bottom of the tank does a 360 with his nose/face in the sand and then goes to his hiding spot for a min, after he acts like nothing happened......what the heck:neutral: