Mandarin with white on fins.

[ohioreef71]

I've had a mandarin for about 6 months now. This pic is from an old thread on here that looks exactly what mine is looking like now. I can't get a good pic of mine. The tank is a very mature 125g with a ton of pods to eat. He also eats mysis good and is not thin. When purchased it had no sign of a problem and after about 2 months the white blotches appeared. Behavior hasn't changed and his appetite is still there. No other fish have a problem. Any advice greatly appreciated.

 

[HumbleFish]

It's likely just Lymphocystis; a virus with no known cure. The good news is it's rarely fatal and symptoms usually disappear in time.