I recently transferred all of my fish from my dt to a qt tank with copper bcs of an ick outbreak. Its a 20 gallon breeder. I had a lot of fish but the majority didn’t make it. I have a hippo tank, 2 ocellaris, 5 chromis and a dartfish. I had some extreme aggression from the clownfish to the chromis so i build them a cage so they dont get bullied. I want to ask if this mark on my chromis is just from bite/bulling from the clownfish or the hippo tank or something else


