HELP!!! What The Hell Is This Stuff???

[RSM]

I had this problem for 3 months. I did the same thing by taking all the rocks out scrubbing them only for it to grow all back in a week. I just started up my tank and had been battling this red turf algae until.....................................I went to Red Coral and got a Sea Hare, (thanks Kevin). Saviour! It devoured all of my red turf in about a week. 30lbs of rock covered in this. This is what worked for me. I have not seen any grow back, its been over a month. Good Luck!