My dwarf gourami in my 20 gallon long tank spends most of his day pacing against the glass on the front of the tank. I recently added some more decor, it sparked his interest for a couple days but now hes back to pacing. He doesn't seem very aggressive to the other fish, so I was thinking of adding another male dwarf gourami, or would it be better to try to find a female? Otherwise I am not sure what else to do to keep him from being bored.