I have a tall (torso-length) 55 gallon with mostly mollies and guppies of all ages. For around a month now, my male orange molly has been chasing my slender black molly who I think is also male and showing breeding behavior. I was worried at first, but the black molly hasn't shown signs of exhaustion or frustration or anything abnormal so I left them be. Eventually the black one learned that he can chase the orange one off by doing the same thing, and last night I caught him actually trying to breed with the orange one, swimming up really fast to his anal fin and turning sideways. But today I noticed one of my ex-baby mollies is now sexually mature and following the black fish around too, and now the black fish is constantly moving and can't catch a break even among the tank decorations. He can't lose them. I have other mollies but they hang out at the bottom of the tank, where it's slow and calm, and these 3 problem bachelors hang out near the top where there's nowhere to hide. They keep flaring their fins at each other and quickly spinning in circles around each other. I'd be mesmerized if I weren't worried about the black fish having no time to rest. Feeding them only distracts them for a few minutes and then they're right back at it. I've tried putting live plants at the top to give them more hiding places but I can't keep them alive. They get pushed around by the filter flow and fish snack at them and then they're dead and gone within like 3 weeks, and the only suction-cup decorations I've found at the store are betta leaves, which don't provide hardly enough cover. Is the only solution where I get to keep my fish buying multiple females? There's technically room but that'd be putting the tank at maximum capacity and then I'd have to worry about breeding.