Frequent Spike on Wrasses Tail

[Huskymaniac]

Every few weeks it.looks like a bristleworm crawls all over my wrasses tail. I suspect it is happening at night when the fish sleeps. Because it happens every few weeks I was concerned maybe this is some type of disease. Does this look like it could be anything sinister?

 

[gentlefish]

Could be recurrent fungus, is there a relation of worsening and water changes?

 

[Huskymaniac]

Could be recurrent fungus, is there a relation of worsening and water changes?

Nope. Never seen fungus on a saltwsterfish ever.