Need some help with some coral issues

[fuzznut]

It has been a while since I posted my tank info and since then have done a lot of changes.

This is my setup.
55gal 24" high
30gal sump

55gal
Jabeo RW-8 (2 other power heads in tank are not on and will be removed)
80lbs rock
40lb argonite sand
Current-USA 4103 / 48" - 60" / 46.8 x 3.5 x 0.44 / 46 Watts / 96 Dual Daylight/96 Dual Actinic LEDs, 192 LEDs Total

30gal sump
Eshopps PF300 Overflow Box
Coral Vue Technology AC20284 Octopus

I have 2 corals (1 died)
I have a group of zoa's that are doing good. Staying open and having growth. The other I am not sure what it is. It was doing good for about 3 weeks and then started turning white. The only thing that I noticed that was off was my nitrates. They were at 25-30. I did a 10% water change and reduced extra feeding to my 3 fish (clown, foxface, damsel) Here are my current readings as of this morning.

PH - 7.8
Ammonia - 0 - .25ppm (in between colors)
Nitrite - 0ppm
Nitrate - 10ppm
Calcium - 380
Carbonite - 12dkh
Mag - 1470-1500
Alk - 1.026 (used refractometer)
Temp - 76.5

I was told to reduce the intensity and timing of my light. Was running the 10 hour full intensity. I went down to 10 hour white - 35% / blue - 90%. That was also the same time as the water change and can't say the coral is getting better but it isn't getting any worse. I am target feeding it the mysis cloudy water portion.

Anyone know what to do to correct this?
You can see from one picture where my coral started dying off. That one completely went white. The other coral is starting with the same issue but I think I might have stopped it from progressing.
The one picture was taken with my phone so the detail isn't too great. The first coral went completely white.

 

[Sk8r]

Probably a light issue, but your water chemistry doesn't offer 420 calcium, which it needs, and it's your salinity that's 1.026, and I do not remotely know what your carbonite is, except a computer cloud service...it could actually be your real alk reading, at 12. 8.3 is ok; plus 10 nitrate is too high for those corals. Needs to be under 2. Can you re-try the parameters? I kind of suspect you might be close to good readings, but the light may be too intense at that depth, your calcium is seriously low, which will kill stony coral, and the nitrate is too high, which will also have a bad effect. I don't know where that nitrate may be coming from, unless you are using converted tapwater or have too many fish, but that needs to be addressed with some water changes.

 

[gone fishin]

Can't see the OP's post so I will go with Sk8r reply.

 

[Dkuhlmann]

Sk8r is either hearing voices or seeing things :ape:

 

[chueu]

Sk8r and his carbonite backup