Hello! I recently added flow to my tank and since my Flame Angel has been swimming very actively. I know they are an active fish, so I am assuming this is normal. He swims all around the tank and stops to eat off the rocks like normal. What is concerning to me is that he goes to the surface very quickly and puts his fin or maybe mouth outside of the water. He does it very quickly, and not over and over, just once and awhile. He does not have any other concerning features or symptoms. All the other fish in my tank are acting normal and not going to the surface. All testing is normal. Thank you for your help!