Alright, I'm probably going to take wrath from people here saying this but... MH bulbs DO NOT change much over their lifetime. Ok, so maybe there is a slight decrease in output but it is minimal. I use MH consistenly in my reseach and I have to calibrate the lamp every week; no change over the past year. Your flourescents will die overtime but not that much in 4.5 months.
Your problem seems like params OR you have some chemical warfare going on. When you say the candy cane has no colour, does it looked bleached? More importantly, is it receding? What else is hangin' out in that tank?
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