Red algae

[Reef Pilot]

You may not have enough flow near your sand bed either, allowing detritus to accumulate there. I have Orange Spot Sleeper Gobies in my tanks, which constantly sift the sand and keep it stirred up. I think that helps, too.

[michika]

I'm just going to point it out that the tank in question is new, 6 months old I believe. This cyano bloom could be natrual and you may have to do nothing more then let time pass and keep up with good husbandry practice.

I too have recently set up a tank and I had a 2.5 month daily cyano cycle. It has finally started to pass without any changes to my current practices. Just something to think of of as you're considering the variety of response you've received.

[daplatapus]

+1 to the above. Every new tank has extra nutrients and time usually solves them. I had actually meant to mention that too but sometimes my brain works faster than my fingers. Thanks for pointing it out Michika