White section of the tail now dark

[chaotic.neutral]

The white section of one of my clown's tail is now dark. Had the clowns for about 3 weeks. Tank is 6 months old. Parameters in check. Anyone know what this might be and how to treat if needed? Thanks so much.

 

[ahiggins]

Has their behavior changed? Can you see any other symptoms of sickness? I’ve seen “dirty” clowns, that have more of a grey than white. I’m wondering if that could be it

 

[chaotic.neutral]

Thanks for the reply. No change in behavior but I did notice last night that the hawkfish also seems a bit "dirty". Not a very good picture but he looks dirtier than normal, especially around the mouth.

 

[ahiggins]

Don’t know much about those guys never had one but if you’re seeing it on multiple I would start to worry. Then again I’m not a fish person lol fish serve a purpose in my tank...if they didn’t I wouldn’t have them