The diver I was with took a few shots, he said he'd email me some results. It was a very pale blue, just like the corals that grow around there. The green one next to it too, just like the greeny sponge stuff there too. Never seen this one during the daytime where they hide in the wall, this one was at night and both were settled in the coral. my torch is an led one with good white light, but not blue/white!
Maggy, I'll PM you.
By the way, nice(?) devil scorpion at Ao Nui today, and whale shark reported off Koh Bida Nok (I was there yesterday)!!!!!!!!!!!!!!!!