Small Spot Clown Tail Fin Edge (Pic Attached)

newaquarist

New member
This small white spot on clown tail edge appeared today. The spot seems a bit "cottony". Otherwise, fish looks great, behaving normally.

I also have a hooded wrasse with a similar size white spot at edge of pectoral fin, has been there for two weeks, hasn't spread, hasn't changed, behaving normally. Other 20 fish are "perfect".

What, if anything, should I do?

thanks for any advice.
 

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