My flame angel have been doing well for months, but today, its skin seems to be some peeling, not a lot, but its quite visible. What causes it? I don't have a pic. My water specs are ok. And I feed them with different things everyday, mussles, blood worms, mysis/brine shrimp, plankton, flakes. Those food named above are with Nori, everyday, meaning morning would be Nori everyday, (green or red ), then at night would be one of those. The flame angel was still doing well in the morning, but now (evening) it became like that. It is still very active, and eating well. Could it be the adding of a UV
sterilizer causes it? BTW
I drip the correct amount of vitamin C to the tank (dosage given by the bottle). And the flame angel peeling is only on one side.