SPS and flow...need help.

[Mik_101]

Will my acropora get better color under more flow? Right now I have about 395 gph in 46 gallon tank. I am installing a Tunze nano stream 6055 shotly witch will knok up my flow to 1055 gph nd after that a Koralia 3or4. With the 3 my flow will be around 1905gph and with the 4 it will be 2255 gph.
Witch Koralia would you guy suggest for my tank? and will the flow help my sps corals get their color.
For lighting I have 2x 175 watt MH and 2x 40 watt actinics.
My water params. are
SG-1.024
Ammoni-0.25
No3-0
No2-0
temp-80
Mg-1026(I think I got my water tsted for Mg and Dkh at OA(ocean aquatins))
Dkh-10.6
pH.8.8(bit to high. How can I lower it to aroun 8.2 or so?)
Cal.-425