I have 3 platy in a 10 gallon with 6 tetras and 1 catfish. There are 2 female platy and one male. Recently the male is swimming on the bottom and his back fins are all tattered. The 2 females are new. I've had the male for a few months. Is it possible that the females are bullying the male? If so what should I do? I don't have a quarantine tank. I'm new to having an aquarium and I didn't realize the importance of having one until I needed one. I feel so bad I'm sorry my fish have to pay the price for me learning as I go. Is there anything I can do to save my platy? Everyone else seems fine. Thanks for any advice anyone has. I appreciate it!