Yes- looks like amphidium. Keep it
simple: cease adding NoPox and coral food for at least a week
Blow the Dino’s loose and either siphon or net it up
Turn off white lights or all let’s for 5 days
During the day, add 1.5ml of liquid bacteria per 10 gallons and at night add 1ml of 3% hydrogen peroxide peroxide per 10 gallons to the sump
Dump the skimmer cup and clean filters daily
Day 6, resume blue lighting at 10% and ramp up daily. Same for white but at 5%