How else to do battle with hair algae

[michika]

I'm suffering with a really nasty green hair algae break out, and I've run out of things to do to try and curb, and eventually cure it.

The outbreak started in late May, but really became uncontrollable in early June. I am 90% sure the original trigger was my switch to tap water in conjunction with prime from RO/DI. Since the outbreak started to get worse and worse I started researching how to get rid of it, and causes. I've never really had to deal with hair algae before, so this is pretty new for me.

Possible cures
- reduce feedings - DONE, tank only gets fed once a week.
- increase water quality - DONE, switched back to RO/DI
- increase flow, and or distribution of flow in tank – SEMI-DONE, added Hydor powerhead. Changing out spraybars for shorter bars, with loc-line fitting at the bottom.
- changing lighting spectrum - SEMI-DONE, changed out 10K PC to actinic, still debating on 175w MH
- more frequent and larger water changes - DONE, I'm still doing weekly water changes, but I've uped the amount to 7-10g per change.
- reduce photoperiod - SEMI-DONE, reduced artificial light sources, and I try to keep sunlight out of the tank as much as possible.
- manually remove algae - DONE, this nasty job is done a few times per week.

Today's parameters are as follows:
pH (8.0-8.2): 8.2
temperature: 79.5
Specific Gravity (1.025): 1.024
Ca (420): 360 ppm
Alkalinity (7-9): 4 dKH <-- I dosed for this after the tests.
Magnesium (1280): 1170 ppm
Nitrite, Nitrite, and Ammonia (0): 0 ppm
What else, other then working on getting my chemistry more in line, can I be doing?

June 30th


July 9th - note the increased algae on the right, and on the gigas clam. It has also increased on the colony pictured in the center of the tank, which is directly in the path of flow of the hydor powerhead.