Can anyone help me ID what this white circle might be? It's on the lower part of a Fiji foxface. I've had it for several months already and it is eating well. It had a similar spot a while ago and has disappeared but you can still see where it used to be. The new spot is about a 1/4 inch from the last one.
It's a 125g tank with a 40g sump. Water parameters are good and did a 30% water change 2 days ago (WC every other week).
It's a 125g tank with a 40g sump. Water parameters are good and did a 30% water change 2 days ago (WC every other week).
