Hey everyone, just wondering if anyone knows what kind of algae looks like a dusting of cinnamon. Sorry for the lack of pics as I don't have a digital cam... But it literaly does look like a sprinkling of a fine dark red/brown powder. It is showing up in patches on the substrate and LR. It doesn't look that ugly YET, but it is growing at an alarming rate... Should I be concerned? Is this beneficial algae? Any insight would be appreciated! FYI... The tank's substraight/rocks were in my previous tank and I've just upgraded tanks only about 10 days ago so the water is near pristene... no amonia or nitrites and nitrates are very low (about 10-15ppm) no phosphates either in the water... thanks.