I have 8 discus. Anyway 3 or my snakeskins they’re on the smaller side they had their left fins damaged I assumed it was by the bigger discus. So they were swimming around with their left fins against their bodies. I bought some melafix to try to resolve the damaged fins. Anyway now some of the fins and sides of my other discus look different. Is this a fungus? A parasite ? Just damage ? What can I do to fix them?