I put 2 clowns in tank at same time. The bigger one is bright orange and the smaller one is a more dullish orange brown color. They got along well for 3 to 4 days. Now the bigger one is really bullying the little guy. the bigger one will pick up speed and hit the smaller one and chase it all over the tank. I found the smaller on in the overflow box this morning luckily and put him back in the tank. The bigger one wont leave him alone. What do I do?