Thought this was hair algae (bryopsis) but now not sure

[gus6464]

I have had this hairy thing growing on my glass only for the past couple of weeks. It's barely in the rock and seems to stick to mostly the glass. I have scraped it off my front glass with a razer blade and it hasn't returned but it's a PITA to remove from rock. It looks like it has a nucleus from which the hair branches out of which is why I don't think its hair algae anymore.

Tests
Ammonia 0
Nitrite 0
Nitrate 0
KH 8
pH 8
Mg 1600
Calcium 450
Phosphate 0.2

Also found this on my glass my it when I took the picture.

 

[Toby_Kourtney]

It looks like hair algae to me. How old is your tank?

 

[Subsea]

It looks like hair algae to me also. Just like there are hundreds of species of cynobacteria, there are hundreds of differrent species of GHA. If it gets established in your substrate, you are in for a long hard fight. Harvest it frequently from the glass. Lettuce Nudibrances, Emerald Crabs and urchins are all good candidate for clean up. My tangs eat it as well.
Patrick

PS. I would consider working on your phosphates with GFO. You need to get proactive with GHA. I have zero measurable phosphate and this stuff is in my substrate. It is a PITA, if you let it get that far. I have removed every rock from the tank and given each rock a 2 minute bath in a 15% solution of 3% h202: corals and all.

 

[FinzAquatics]

How much direct and indirect sunlight is the tank getting?

 

[gus6464]

It looks like hair algae to me also. Just like there are hundreds of species of cynobacteria, there are hundreds of differrent species of GHA. If it gets established in your substrate, you are in for a long hard fight. Harvest it frequently from the glass. Lettuce Nudibrances, Emerald Crabs and urchins are all good candidate for clean up. My tangs eat it as well.
Patrick

PS. I would consider working on your phosphates with GFO. You need to get proactive with GHA. I have zero measurable phosphate and this stuff is in my substrate. It is a PITA, if you let it get that far. I have removed every rock from the tank and given each rock a 2 minute bath in a 15% solution of 3% h202: corals and all.

Ok thanks i will get some chemi-pure elite.

How much direct and indirect sunlight is the tank getting?

No sunlight at all. Tank is far away from any windows.