I have a 7 in oscar in a 65 gallon tank with a 5in jack,5in pumkin seed sunfish lol and a 9in pleco but for the last week my oscar has been putting its mouth against the glass and trashing aroung for about 5 to 10 sec. He does is so hard that water in comeing out of the tank any ideas on how to make it stop. He looks completly healthy and has been eating good. Is it just angery?