can someone please tell me what I'm doing wrong?

[Nano]

Sps... Ughh.. hair algae... Double ughh.. k here's the story.
I had a nice gha outbreak over the last 2 months after the move. I am using ro/di with nearly brand new filters since the move. I am running phosban, carbon and recently started prodibio bioptim and bio digest. The hair algae has not subsided even a little, in fact its progressing. I have now lost 6 sps frags to rtn in the last month and a half som choice frags too. For those not familiar my set up is

AI sol blue at 50% overall
Phosban and carbon reactors
Refugium with chaeto and live rock
Live rock 40lbs
dry (becoming live) 15lbs
Ato
Tunze 9002 skimmer
3 Hydor 425 powerheads
Etc.

Params

Salinity, 1.025
Nitrates and nitrites 0
Ammonia 0
Phosphate undetectable
Ca 420
Alk 9-10
Mag 1350
Temp 78-80

I am at my wits end now. Seriously considerring shutting it down til I get the 120g up.

Please help guys.