Need diagnosis

the picc

New member
Good Afternoon, I hate to make this my first post on this site but I've been a lurker for quite some time.

I recently cycled a 120 gallon with live rock and slowly started to add fish and one of my damsels has started to acquire these white 'fuzzies' all over his body. I'm not 100% sure what it is just based on my basic Google searching and reading.

Can anyone help me identify what this is? Thanks in advance.
 
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