help id this algae

[wetone]

I have a 75g with about 40g of sump. THere is 100 lbs of LR in tank and another 50 in the sump with a 5" DSB in the sump. I am using a 4' tall 6" diam CC skimmer powered by air stones. I have 2 250W MH and 2 110 VHO actinics, all bulbs are less than 2 months old. The tank is filled with LPS and SPS as well as 4 fish. There are about 12 turbo snails and 12-15 blue legs and red legs. I have 0 nitrate or phosphate (none in my RO topoff either).
I have this algae which is growing on the rocks and continues to come back after I scrub it off. I think it is hair. I am ready to order a new Precision Marine bullet 2 skimmer for tank, but just want to get the opinions of others if this will eliminate the algae. I went to the LFS and was told my TDS is around 415.
Any thoughts on ID'ing this stuff and will the new skimmer fix my probs.....
Thanks

 

[wetone]

here is a picture.....

 

[krishj39]

looks like standard hair algae to me. it can be a real nuisance. since all of your water parameters are good, maybe your lighting is off? old bulbs, lights on too long, etc. it can be tough to get rid of. i primarily control mine with my lawnmower blenny. i still have patches here and there, but honestly it doesn't bother me, makes it more natural, IMO.

 

[wetone]

Lights are new...actinics are on for about 7 hours, while the MH's are on for about 4 hrs each day,