Bleaching or Dying SPS

[bvanhoveln]

I am trying my first SPS (Acropora)

I have had it in the tank about 1 month - it seems as if the coral is beginning to bleach (turn white)

what are the most common causes of this?

Too much light, too little?
Too high a calcuim number or too low?

I don't have the water numbers at this time, but I am looking at what may be the most common causes of trouble with SPS.

Thanks

[twon8]

alkalinity....

do you know where yours is at?

[twon8]

you also need to give us some tank specs

lighting, flow, skimmer, total water volume, how do you mantain alkalinity and calcium, etc...

[bvanhoveln]

My current setup is as follows

-90 gal with 30 gal sump
-closed loop with OC SS pushing about 2300gph through four different outlets
-2 250W MH 10000K, 2 65W blue atinic
-GS-2 skimmer

don't know any exact water parameters at this time - last time I checked everything was great (about 1 week ago), I am at work now and don't have my sheet with the exact numbers.

[twon8]

how are you supplementing calcium and akalinity?