Short note to say that I've obseved one of my Mithrax crabs eating red bubble algae. I was having the impression the RBA was slowly reducing in the tank, but I wasn't 100% sure. A few nights ago I saw one of the crabs eating it (sorry, no pictures). But it must be quite nutritious for they are taking a lot longer to get rid of the RBA than they did with the GBA/valonias..... I'm not even sure they will one day eat them all, but I hope so... ;-) BTW, Galaxea ...