sps problem

[tropical hawaii]

I have been trying to keep sps for about 6 months now. And for some reason I cant. They just seem to slowly die and I need to find out why. Alk 9, ph 8.2, calcium 475, ammonia 0, nitrite 0, nitrate .5 salinity 1.025, and my light are 2-250 watt mhs and 8-65watt anctics, plus I have a g-2 skimmer and a refugium, and 4-koralia 3's on a timed wave maker. It is a 125 gallon tank with 100 lbs live rock and 3" sand bed. Plus I us only ro water. Can someone please tell me what am I doing wrong?

 

[redox]

475 calcium is high. I woudnt go over 450. Alk seems high as well. Natural sea water is around 8.

 

[Hop]

Where are you getting the corals from. I don't need an exact name, just the LFS, online etc... Do you know if they are wild colonies or aquacultured? How are you acclimating them and how are they dying. Which SPS have you tried to keep?