Help identifying strange algae

[FragIt Dan]

+1 on the chemiclean, no problem for reef tanks. I use it on several without problem, as already mentioned, take your skimmer offline. I opt to remove the skimmer cup and leave the skimmer on to increase aeration, but this is with an in-sump skimmer and it leads to lots of foam in the sump. Also, carbon comes out during dosing. I'll turn the skimmer back on (replace the cup) for a few hours before my water change and turn it down a bit, and empty the cup (will be every couple of minutes for the first bit). When it calms down I do my water change. I'm under the impression this takes a lot of the crude out prior to the water change so gives me a cleaner tank in the end. Then the old carbon goes back online and gets changed the next day. It is also a good idea to inoculate your tank with a bacteriological product like MB7 afterwards as the chemiclean will wipe out a lot of the bacteria in your tank, bad AND good,
Dan