Blue corals turning green

[ghostman]

Since starting Bio pellets, some of my sps skin has turned green. The bright, vibrant blue of my superman, pokerstar, and rainbow is now green with a blue hint around the edge. My torts are still blue however. Has anyone experienced this? Did I strip anything out that I shouldn't have? My only parameter change has been a slightly lower pH. Here are the specifics:
SG-1.026 refractometer
PH-8.1 AC3
Alk-8.0 Salifert
Ca-420 Salifert
Mg-1380 Salifert
Temp 78-80 AC3
PO4-0.05 Hanna
NO3-0.25 Salifert
120g with 8x54w T5, BK 180 mini, using TM Pro, B-ionic, and vertex biopellets in a zeovit style reactor. Just enough flow to make the pellets bubble.
Thanks.

 

[Troylee]

I would start dosing lugols a drop a day will help keep the blues....
Most likely your skimmer is striping iodine from the tank since it is overdrive with the bacteria culture being produced...

 

[smokenax]

it sounds like nitrates.

 

[Elan]

it sounds like nitrates.

actually phosphates, or thats what i have been told / past experience

 

[Murfman]

Have you changed bulbs recently?