Montiporas getting lighter in color?

[Boboe77]

Hello all,
I have 3 montiporas (green, purple, red) and they suddenly started getting lighter in color. They were doing fine about a week ago. The only things that have happened to my tank was I had a bubble tip die. A friend told me he was getting too much light. Another thing was I installed a chiller.

These are my parameters and specs below.

ALK - 9

MAG - 1350

CA - 420

Nitrate - 0

Haven't tested phosphate but I added GFO about 2 weeks ago.

Lighting: Kessil A350w about 6 1/2 inches above waterline about 65% intensity and 9 inches above monti's

just put in 2 new chemipure elite/blue

Mounties are higher up in the tank

Thanks all!