hello, I recently set up a reef aquarium. . . Im real happy with all my levels. I have noticed a white fungus looking stuff spreading accross my live rock. I have tried to take many pictures and many of them didnt work out, but i snapped out which shows the white fungus looking stuff on rock, if n e one could tell me what this and if it is a good thing or bad thing, i would appreiate it a lot thanks. . . .