Hey Guys...I have one nice rock that is covered with yellow polyps, which are doing great by the way, but there is an incredible amount of GHA between the polyps...My CUC does not pick around them, so I have this nice clean tank, and one rock full of green algae...The Polyps do not seem to mind it, just wondering what I can do to pull it out without disturbing them...My params are fine, and I just recently knocked my hours on my lights back...any ideas other than the usual?

Happened to me. Soon the polyps will mind.

Get an emerald or two depending on tank size and up your water changes. GHA is bad news, better to stop it now.

Parazoanthus (yellow polyps) are considered semi-aggressive and put out a descent sting that deters fish and other organisms from eating them which may explain why your clean up crew is avoiding that area. Adding more inverts may do nothing to help.

I'd recommend next time you do a water change, save the dirty water in your bucket. Then take the rock w/ the yellow polyps out of the tank and place it into this bucket. Use a toothbrush to very carefully and softly remove the green hair algae, trying not to disturb the polyps too much. Then toss it back in the tank. You may have to repeat this a few times, but hopefully this will help.

The other possibility in addition to inverts avoiding the area could simply be the structure of the rock. Perhaps its structure (for example, the holes, cervices, etc) traps waste that normally should be swept away in the water current. Adjust your flow to hit that area a little more to make sure the rock is receiving good circulation could help kick up nutrients/debris that is feeding the algae.