What is this?

[catj]

I am trying to figure this one out, is there anything I can get that will eat it? It's only on this spot and has not gone to any other locations in the tank, advice input is all good thanks

 

[Best Fish-Jake]

Appears to be a decent amount of red bubble algae.. Unfortunately it's fairly difficult to get rid of in a reef tank when it spreads. It's not harmful, but can become a nuisance fairly quickly.. I would remove that rock from the tank.

 

[Treasure Coast]

Might be Red Slime (cyano), hard to tell by pic. If it is you can buy Red Slime remover powder.

 

[DSC reef]

I agree with red bubble algae. If it's only on the one rock maybe you can remove it from the tank and scrape/scrub it off. Don't pop them in the tank though, it spreads fast.