SPS Bleaching

[Dsotto]

I'm new to the sps crowd and have been doing tons of reading here. I have a birds nest that is starting to bleach from the bottom. I had it in a pretty high light area and moved it because it was starting to look pail. I also took a picture of one of my other corals that kind of looks like its doing the same thing. All of my other sps look great with great polyp extension. Any help would be appreciated.

Water Parameters

PH 7.8
Ammonia 0
Nitrite 0
Nitrate 0-5
Calcium 440
Magnesium 1320
Phosphate 0
Alk 9
Salinity 1.025
Temp. 78

 

[Touring]

hows your flow in that area?

 

[Dsotto]

The flow is pretty good there. I have about 6 other sps on the same rock that have great polyp extension. Here is a FTS. I have a 1600 gph return pump, 1 hydor 750 power head on 1 end and a hydor 1050 power head on the other.

 

[maxb]

do you dose any coral food? Your water could be too clean and the corals are starving

 

[Dsotto]

No I don't. I have been reading about what everyone uses and was leaning towards the Red Sea products.