I have 6 cichlids which we rescued after they were abandoned at the local PetSmart at the beginning of the pandemic. They are in a 55 gallon tank with lots of hiding place decor and live plants. Also in the tank are platys and a pleco. A few weeks ago I noticed that one of the blue ones was acting weird and hiding a lot. At first I thought the fish might be ill but now I think it is being bullied by the other cichlids. I see that its fins are a bit tattered and so on. Would it be advisable to move it to another tank? I also have a 20 gallon tank with platys and 2 Cory catfish. Open to suggestions.