That looks like the red algea i am battling... here's a link to the thread
http://reefcentral.com/forums/showthread.php?s=&threadid=850388
I sent a few frags of this to a fellow reefer and he told me,
"Here's what eat's the algae so far
moorish idol ( seems to think it's candy It found it within 5 seconds of adding it to the tank. If your tank is big enough a juvie moorish idol is probably your best bet.
Other tangs, Kole expressed interest and grazed a bit, yellow and naso had minimal reaction.
green caribbean urchin ( went after it within a few minutes of having it in the tank. Not the same response I get from it for dandelion greens but definately a stronger response than ulva or kelp.
What didn't respond to it.
Any snail ( stromatella, turbo, astrea )
Any hermit crab ( caribbean blues & reds )
-thank's for the zoos as well, it was a nice surprise.
I'm going to try a few different herbivores, see how it goes. Right now it really seems the tangs with wide scraping mouths are the most interested. I don't have access to one right now but I bet a grazing blenny would do a number on the stuff as well. "
Hope this helps.