Shouldn't be anything the asterina is doing. They'll just be slurping the dead/decaying coral tissue probably.
My nopox bottle says highest dose is 3 ml per 25g per day above 10. Is it recommended to use 4 ml when they are so high?
You mentioned you were gone for 5 days. Do you have a dosing pump or did someone do it manually for you?
Have you tested for nitrites, ammonia?
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