new saltwater tank owner FOWLR. I recently found something growing on the backside of one of my rocks. I tried desperately to take a good picture of it, but to no avail. Here is about as good a description as I can muster, it looks just like a patch of fescue grass. Green with long (1/2" "blades" for lack of a better term) from it. I would love to know what it is and if it is dangerous to my tank environment. A pic with description would be great or even a link to someting you my think this sounds like. I cant imagine it being a plant. any help will be greatly appreciated I am obviously ignorant to this subject.