Tiny featherdusters.

[Hp1836]

Those little tiny white featherdusters that everyone seems to get and usually don't bother anything. There is a large mess of them on my zoa colony rock slowly taking over and causing the zoas to recede. They are not really anywhere else. Does coral dip/bio advanced kill them? If so I'll just dip the rock. If not does something eat them? They are minimal everywhere else just taking over this one rock

 

[Matt L]

Those little tiny white featherdusters that everyone seems to get and usually don't bother anything. There is a large mess of them on my zoa colony rock slowly taking over and causing the zoas to recede. They are not really anywhere else. Does coral dip/bio advanced kill them? If so I'll just dip the rock. If not does something eat them? They are minimal everywhere else just taking over this one rock

If the rock is removable, I’d take it out and scrub it with a toothbrush in a container of tank water. Or try scrubbing it in the tank, and siphon out the featherdusters.