Today I looked at my fish and noticed their gills were more red than usual. They aren't looking very bad but are still more red than regular. This is especially visible in my Neon Dwarf Rainbowfish. My Otos seem fine, as well as my pearl gourami, Zebra loach, and my Black Phantom Tetras. I added liquid ammonia reducer and also filter media to reduce the ammonia. My carbon was removed from my filters as well so I could use medication for my fish. Any ideas on what this could be? And did I do this correctly to treat it for now?