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I have a 155gallon reef and currently running 3 150w metal halides. I am thinking about switching over to 3 160we Kessils. What do you think?

I found this growing in my sump. The head of it is about 1 inch.

Our fixture has 3 metal halide bulbs. We are currently runnig 100000k and are replacing with 3 140000k. We have not changed the bulbs in about 3 years. Do you suggest changing all 3 bulbs the one time or should we swicth them out gradually over a period of time. We have a 155gallon bowfront with...