Scarab, after Dan's advise I took out all my turbo snail (left 1 working OT in my overflow box) so no more cleaning crew working at those inaccessable parts, those dots are coraline algae which are PITA to remove. The urchin can't access it as they are blocked by the LPS too. But good thing is that all my dwarf stay there whole day long pecking on the glass.
John, Cool... see that it is very fat too, must be having good life over in your reef Glad you were able to come in time to adopt it lol, can't image 4-5 fishes in my quarantine tub lol. I removed those anthias that I can managed to catch as they are just too high bioload