I have one platy that is really aggressive towards my other platies (he's a male, but I only have other males in my tank). He has even started to nip my bettas fins! Is there any way I can make him stop this? Or do I have to get rid of him?
Right now in the tank I only have 3 male platies (counting him) and 1 betta (male). The tank is 20 gallons. Would it help to get more fish?