Dark spot on my clownfish

[linjuncheung]

I just spotted this brownish dark spot on the white part of my ocellaris clownfish. What is that and what should I do? Thanks!

I have him for like a year. There is no abnormal behavior that I can see. Water parameter is 0 ammonia 0 nitrite and 25 nitrate. All other display tank mates are fine.

 

[Tahoe61]

Likely hypermelenization, from corals stinging the clown, not unusual and typically harmless.

 

[HotRocks]

+1 I agree with @Tahoe61

https://www.reef2reef.com/threads/clownfish-hypermelanization.96328/

 

[linjuncheung]

Likely hypermelenization, from corals stinging the clown, not unusual and typically harmless.

Thanks!