Help with persistent green algae

[jtlmnop]

My reef tank is 6 months old. It has gone through a few rounds of uglies, but seems to be doing better in recent weeks.

I have this green algae on the Marco rock, and none of the CUC(scarlet hermits, fighting conch, trochus, cerith, and nassarius) seem to touch it. I can’t scrub it off, like I did with GHA and other algae. Tooth brush and suction don’t affect it.

Any thoughts on what it is, and how to get rid of it?

TYIA.

 

[JumboShrimp]

I see you didn't mention Emerald Crabs... maybe their little tiny pinchers pluck that out like GHA (?)

 

[jtlmnop]

I see you didn't mention Emerald Crabs... maybe their little tiny pinchers pluck that out like GHA (?)

Maybe worth a shot. I’ve had two rounds of GHA that I dealt with my scrubbing, suction and water changes. So not sure