White Crystal looking stuff on rocks

luvsaltshops

New Member
There is this white,web looking, and almost crystal looking stuff with about 1 inch long growth, that continues to grow on my rock. It is only on one rock so far. But, this morning I noticed a small little web, without the branches sticking out, on another rock.
Does anyone have any idea what this may be? And if it is harmful to my fish and corals?
One day I touched it and it was kinda hard on the rock and a bit slippery feeling. Some stuff came off when I touched it and just floated up.
Thanks for helping me figure out what this is.
Jo
Please help figure out what this stuff is and is it harmful, Thanks:confused:
 
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