Rawr!

So my nitrates are undetectable, and my phoshpates, well i supplied a pic of that test... so why does my tank look like this!!!!!

 

Because hobby grade kit's can only test so accurately. There's always some phosphate and nitrates in the water that get used up to a point that test kits can no longer detect them.

 

The hair algae will feed off the detritus built up in the cracks and crevices of the rock.
You need to pull clumps gently by hand and then use a turkey baster to blow all the junk out of and off the rock to be filtered out in the sump/fuge.

Do this no less than weekly and pretty soon your rocks will look much better

good luck

 

new lights, tons of flow, im running a gfo reactor and a fuge lol I pulled a strand of chaeto out from between my eagle eye and fire and ice zoas that was 11 inches long lol. It was started a couple of months ago by a 1/4 inch piece. Its just dumb. Im getting a Scopas tang ive watch chow algea for months to take care of this now lol. Now i just need to get my ember blenny to come out, trick my chitons to let me move them to another rock section, and feed my clown goby to a shark before my acros die

 

The nitrates and phosphates aren't in the water, so you can't read them with a test. They're being used up by the algae.

 

try running some of this Purigen

edit-after seeing your alk was off in your other thread what is your ph at? if it is low try gettin it back up from what i recall hair algae and the likes don't tolerate 8.4 as well as a more neutral ph. another culprate are your bulbs how old are they what spectrum are they and how long do you run them?

 

Ph is 8.2

 

WOW dude thats pretty rough..i hope your not putting my frags in there lol....although it kinda looks cool actully haha...But im guessing its your lighting thats new...i had a small outbrake of GHA when i got my T5HOs

 

Naw its something else. Its not like anything new is grow (not that there is any space) All my corals are doing great.

 

I had some intense algae like this once. Raising my magnesium helped quite a bit and manually removing giant clumps. I'd try that and stay the course. Took like 4-5 weeks to get rid of it.