Algae ID help please

[KindOfSalty]

I have been battling this unknown algae for a while now. Included is a photo. The photos aren't that good but thats all i have right now. It seems like a hair type algae but it is very dark almost black. And grows long random strings up towards the lights. Weird. I've tried lights off for a week. Seems to die off and then comes back when lights are back on. I've done multiple water changes. I've tried algaefix that seemed to just make it grow and spread faster. Of anyone knows what this is or how to get rid of it will be greatly appreciated.

 

[armison89]

i might have the same algea. is it growing on the sand glass and rock? i get large circle on the sand and glass but it comes off very easily but it comes back in a few days.

 

[KindOfSalty]

Yes there is a huge patch on the sand. None on glass.

 

[armison89]

i have no idea how to get rid of it for good im just keeping it at bay by sucking it out.

 

[Monkeyfish]

Can't tell from the pic. Try posting this over in the macroalgae forum.

It kind of looks like cyanobacteria. Is it slimy? Does it "grow" in mats? Does it tend to show itself more when the lights are on then off?