Parameters aren't out of normal which is good. KH could be higher and No-3 spiked but I'm doing a water change tomorrow anyways.
I'll try a dip, 1/2 water bottle when feeding, and moving them back to the sand bed. Do you know if the polyps can clean themselves of sand? When on the sand bed they fill up quickly and I worry they'll get super irritated or worse which is why they're higher in the tank.
I haven't noticed anything touch them except maybe a hermit crawled on it. The yellow reminds me of this post:
Hey, anyone have any idea what this is? I'll find it on my sun every now and again, but I don't know what it is. My sun is usually open and eats well (and has grown quite a bit since I got it).
www.nano-reef.com