Is this Hair Algae on my back wall?

My tank has been running for almost a year now. I have seen nothing growing on the back wall except some coraline algae since i started the tank. Recently i have been seeing some Hair Algae, i believe growing on the back wall? I recently lost my Bicolor Blenny and am wondering if since he is gone it has started to grow? He used to swim along the wall and pick at it, which i assume he was eating algae. I have also heard that blennys will slowly starve because they are herbivorous and do such a good job eating algae? Anyway here are some pics and would like some input on what to do and if it is an issue? I am running SeaChem SeaGel which is a carbon and phosphate control media and change it once a month. And the algae is not on any of my rocks, glass, sand or powerheads?
Thanks

 

what kind of lighting do you have and I cant tell if its GHA or turf algae cuz it is short enough to be turf algae

 

i have 150 watt MH lighting?

 

bump
anyone have any advice on what i should do?

 

You could get another blenny but be sure to supplement it with some sheets of nori or something.

 

i have snails, crabs and a cleaner shrimp. What type of cuc member should i be looking for specifically? Cause i have a mixed variety?

 

You could look into an urchin.

 

My tank is only 30 gal though and i hear they dont "tread lightly"

 

If you've seen any of your snails eating it, you could get some more of the same snails. That would be the easiest solution, as lots of CUC members only eat a few of the algaes, not all of them.