Problems with brain coral turning white

[mac1025]

I am having trouble with some of my coral turning white and seems like they are dieing. I have a red lobo, a moon brain and another sort of brain coral and all 3 are doing the same thing. Can anyone help me with this problem?

 

[majormaz]

Check your parameters.

 

[mac1025]

my paramaters are as follows
PH-8.1
Iron-0
KH-140 mg/l
Phosphate-0 mg/l
Calcium-460 mg/l
ammonia-.01 mg/l
nitrite-.01 mg/l
nitrate-10
salt-1.24
temp. 81

 

[mac1025]

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[mac1025]

here is a pic of a green lobo that is turning green on me. Any advice would be greatly appreciated. Thanks

 

[mac1025]

Pic of a moon brain that seams to be dieing as well.

 

[majormaz]

On the areas that are white do you see the skeleton?

 

[shinobi9119]

could it be lighting?

 

[mac1025]

yes i am seeing skeleton. The lighting i am using is
ODYSSEA 48"
Metal Halide
2 - HQI 175W
2 - CF 96W Actinic Blue
6 - LED Bluemoon
I am using a 12 hr. on and 12 hr. off and this is for a 110 gallon tank that is 30" tall

 

[majormaz]

How were the corals at the store?
Is there anything picking at it? That may be the answer.

 

[mac1025]

all 3 appeared to be healthy as far as I could tell. They all have changed in apperance and I haven't witnessed anything in the tank picking...I have 8 total fish 2 tangs 2 clowns and 4 chromis, also 6 or so shrimp and some crabs and snails

 

[majormaz]

What type of tangs?

 

[mac1025]

Vlaminging tang and Scopas tang