Cyano? can it stain rock? help!

So I have had a "red" algae problem for about 6 months now. Ive been told time and time again that its cyano, i dont believe it is (at first). It didnt blow off with a power head, it wasnt in a blanket, it didnt even come off with a toothbrush! Sadley enough ive resorted to two different chemicals. Chemi clean...which did nothing for me, and right now im on my fourth dose of algae fix, which i was recomended by a few people. I see no affects what so ever.
My tank is a year old, i have a red sea prizm skimmer, a 15 gallon sump. and do weekly water changes of 8 gallons of r/o water. When i tested for phosphates i got back 0 but that doesnt really mean anything. my nitrates i have been unable to get down to 0 (they are at 20) when my taxes come back im doing a big water change in hopes that it might bring it down more.
This algae is driving me nuts! my lights are down to 5 hours a day. Ive tryed everything...and im still unsure what it even is!
is it possible to have stained my live rocks red?
please help any information would be helpfull!

 

Picture please - I suspect its red coralline ! but pic to start with, and your parameters please.

 

nitrates 20. ammonia 0 nitrites 0 ...thats about the only thing i have to test for.. i tested for phosphates about a week ago and got 0. I ve looked into red coralline... it doesnt look like the pink and purple that i have in my tank, when i take a rock out and try to scrub it.. it leaves the water red. but doesnt remove any of the algae.

 

its a crap picture, but for my money I;d still say red coralline ;-)

continue with water chanes to get the nitrates to zero.

nothing on the sand and you saing that it doesn;t bow off really points in the positive direction of coralline.

 

If you touch it and it does not feel slimy probably just coralline as Crimson posted,

 

Yeah cell phone sucks for pictures, but its about the only thing i have. Like i said ive done my fair share of looking into coralline algae and i dont believe thats what it is...IF it is.. its ugly as hell. lol, but thanks for your post
much appreciated

 

Its not slimy to the touch, at one point it looked a little fuzzy though.

 

I have it everywhere. when your moon lights come on does it glow a little?

 

Emily, I think its red coralline - you have me on the "fuzzy" aspect, and to that my best guess is it might have had a nuisance algae on top of it that appeared to be fuzzy. I am sorry you find it ugly, I suggest removing the rock as it will spread. Many people would go after that color as 95+% of the coralline out there is purple and it always seem that the other 5% is green.

Anyway, I hope it is coralline – if you think it might be something else (ie, something bad) please take a better picture for us and we can continue to help you diagnose. I guess in the meanwhile, is this showing up anywhere else in the tank ?

 

i only have red coraline like that on my Lace rock, that i have as a cave, all my other rocks are purple and white/pink but the red is pretty cool at night its glows pretty good!