Help with identifying red growth on live rocks

[Justfbilly]

I have this red growth on some of the live rock in my reef tank. It doesn't look like an algae and it is only in patches on the live rock. I have attached a picture of what it looks like. Does anyone know what this is and I am also wondering if running GFO would help to get rid of this growth? Thanks for the help.
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[LBehr]

Could be an encrusting sponge of some sort. Most sponges are killed by being exposed to air. It could also be a funky algae or bacteria like cyano. The best way to fix that would be to lower nutrients by frequent water changes and gfo would also help.