We recently bought two blue dwarf gouramis, one male and one female for our 10 gallon tank that only has two other cory cats in it right now. They have both been in the tank for about four days and the male has started chasing the female, especially at night. Would getting another female solve this? Also, what other fish could anyone suggest that would go well in this tank? We originally had another betta in the tank who he hadn't been aggressive towards yet but she ate the gourami's food and got extremely fat so she is in the quarantine tank temporarily (and doing much better!).