Sounds like a lighting issue to me as well. Also where are they placed in your tank? Very low in the tank or closer to the top? From my experience yes the color can be reestablished once proper lighting requirements are met.
I have t5 HO without individual reflectors. The bulbs are 7 months old. Running 2 x 12k, 1 x 75.25 from UVL and 1 x actinic from Gieseman. They are at the bottom of the tank. Main lights were only on for 6 hours a day. I just increased that to 7.
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