Fenwaybarks
Aquarium Advice Apprentice
I've had 3 young severums for about 3 months now in a 55 gallon tank. After the first two months they were doing fine without problems then i added a jack Dempsey. This fish was too agreessive toward the fish so i removed him. There fins were beat up and they had these werid black markings on their backs. At first i thought they were just from the fish hurting them but now after a month without the jack Dempsey the black discoloartion is still there. I have no idea what this is or what to do ive attached pictures. Please help!!