Coral Problems, any thoughts/suggestions?

[asylumdown]

I've never seen carbonate hardness expressed in those units, what does that translate to in dKH or meq/l?

How are you maintaining your water water chemistry? Are you using an auto-doser, or are you dosing by hand? If you dose by hand, how often do you test, and how much do your parameters fluctuate week over week?

IME SPS corals have a very hard time dealing with large swings in carbonate hardness over time, it stresses them out to no end. They can adapt to a pretty wide range of parameters, but not to regular swings in those parameters. I never had any luck with SPS until I got a doser and was able to keep my numbers (especially carbonate hardness) steady over a period of weeks. If your levels are fluctuating and you have high nutrient levels, it might just be too much for SPS.

[props]

Nitrate and phosphate are a tad high imho but shouldn't be an issue to why you're losing croals. How do you introduce corals to the tank?? Why I ask is you could be burning them to death due to your water clarity. Start them from the bottom of your tank in high flow areas or decrease the time your main lights are on.