Duncan issue

[jkhuffman]

I have a smaller 15 gallon column tank and my Duncan was doing fine for about a month or so. Started getting new heads even. Now it doesn’t open very much. Now today I noticed some little black things on the newer growing heads just kinda moving around. Not sure if they are moving in the flow or if they are alive. They are really hard to see. But still nothing opening

 

[JumboShrimp]

I’m not a pest expert, but maybe it couldn’t hurt to do some research on a good coral dip? BRS has a good video or two.