What is this annoying algae?

[ScubaNemo]

My tank parameters are zero phosphates and about 15-20 nitrates. This algae started a few days ago and never had it. I have to stir the sand 2-3 times a day and it comes right back. Also started growing on the rocks and some a corals that I have to blow it away with a turkey baster.
My tank is 5 months old. I'm running GFO and chaeto arid reactor.
Any advise on what it is and how to get rid of it?
Thanks guys

[xanthurum]

Not algae it's Cyanobacteria.

[thegrun]

...well let the debate begin! To me it looks exactly like Cyanobacteria.

[ScubaNemo]

And why is it forming and how to get rid of it?
Will it harm the corals?

[jraker]

Check your nitrates and phosphates. Make sure you are getting enough flow in your tank and there are no dead spots.

[insomniac2k2]

Cyano.

Try to manually remove what you can and adjust your flow for dead spots.

[ScubaNemo]

I increased the power heads flow and that seemed to help a bit. Phosphates are zero and nitrates are 15