Red monti cap getting washed out?

My montis seem to retain colour at varying light levels. Moving them up or down in the tank doesn't readily effect them. The only time I noticed a washed out appearance (uniform over the surface of the monti) was a long time ago when I attempted a blackout to combat dinos. Is the washed out appearance completely uniform, or is it more prevelant on a part of the monti that gets less light?
 
Mg levels?

well all levels would help.

I've found mg has an effect on my caps... too low or high for extended periods and they wack out...
 
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