parasite id

I’ve had an issue with a parasite associated with RTN of Acropora palmata and cervicornis in my reef tanks. They seem to infest the corals especially after microfragmentation or any other stressors. I have removed dead corals and cut off the “infected” areas. I have also tried various treatments...

This filefish has been healthy and eating mysis daily. Yesterday I noticed his feces was seemingly large and he seemed unable to pass it. Throughout the day it progressed to the second photo. Today it looks back to the first pic. Any idea on what it is or what to do for it? Thank you to all.