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Can you brush it off either with your hand or by blasting it with water? If not its coraline. But it doesn't look like coraline from your pictures. I may be wrong.I got these on my rocks - don't know if I have to take care of it or leave it.
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My tank is actually almost 3 years old - http://www.aquaticlog.com/aquariums/larrysy/2
I just did a re-aquascaping due to an algae outbreak while I was on vacation for 1 month.
I did the test suggested by crabs - looks like it's coralline.

