I just got a beta yesterday and he's in a 10 gallon completely cycled tank with a heater and one plant. (the other bulbs didn't grow) and he keeps attacking the sides of the tank and flaring up at himself. He swims like he's on crack towards the sides too. What are ways to decrease him seeing his refection on the sides of the tank. I do have a background, in the back of the tank. Maybe its to dark? He's seeing his reflection against that too and the sides. Not so much the front of the tank.