I have a 3 gallon tank with a betta and an orange platy in it. The betta sometimes chases the orange one around, but he never seems to catch her. But now I see her fins are frayed and the scales on her back look very rough. I have considered fin rot but I figured I'd better get another opinion. Is it just that my betta is beating up on her?
The tank is filtered and heated. I was told by the petsmart people that the tank could hold another fish. She's not that big either, since I didn't want the betta to feel like his "dominance" was threatened.