Lack of polyp extension?

[Reefpro]

Can someone help me figure this out.. I have a 300 plus gallon system with lots of high end sps (100+ frags and colonies) I have excellent water flow 3 koralia 1450 and 2 wp40 and two off brand double head poweheads, I run 6 panels of evergrow LED panels and are turned up to 55% on whites and 85% blues. My water chem is as follows

ca 470
Mg 1475
Alk 9.3
Nitrate 0
Phosphate 0
Salinity 1.0255

Fish inckude:
8 wrasses
5 tanks
Coral beauty angle
Pygmy dwarf angel
Hawk fish
Two true percs
Couple damsel
Couple star fish
Several snails and hermits

I change 50 gallon every two to three weeks

I have great color and growth but little to no polyp extension. What gives? This tank has been up and running for close to 2 years
Any help would be appreciated

 

[blufin]

how long have the angels been in the system? They are known for picking at sps.

 

[Reefpro]

For as long as I have have had the system up and running. I have never witnessed them picking at polyps but by no means they aren't doin it. I see good polyp extension at night but when lights come on they shrink awy

 

[ritter6788]

I agree it's likely the angels. I've kept several dwarf angels and they always picked my sps. Never seems to do damage but they keep PE to a minimum.

 

[Genesis Corals]

+1 on the angels. The SPS learn what kind of environment they are in and know where they can have their polyps out or not, kind of smart.