05-13-2008, 12:38 PM
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Definitely cyanobacteria. Cyano operates using highly complex systems of photosynthetic membranes. The next step is obvious.
I once battled a bloom and I swear by the method of starving this stuff. I kept the lights off for three days and observed as it disappeared from my sand and partially my rocks. It covered my sand much as it has yours, and after three days the sand was white as bone.
On rocks it's slightly more difficult to rid but it can be done by hand if you have tried all methods of stopping it (water changes, maintaining proper parameters, using various chemical-absorption pads etc). I completed the removal of it from my system by using a turkey baster to suck up the growth, and then spitting the contents of the baster through my finely woven fish net which caught the detritus, but filtered the water.
Good luck with this, it's painful to deal with but you'll be happy once it's gone. I know you've vacuumed it out for now, however if it returns I say you employ the above method.