Interesting. Personally I don't see the 10K bulbs being a problem for your SPS. When I first started this tank I was running 10K halides with supplemental actinic T5s. Sometimes my T5s would burn out and it would take me a few weeks to find replacements and in the meantime, my tank would be strictly on the 10K bulbs for days. I didn't notice any change really. 10Ks definitely do grow SPS fast. They also grow algae fast too though as Chris suggested. I recall film algae on my glass being a problem every 24 hours. In fact, that's how I can tell when my current 14K bulbs are warn out. They shift closer to 10K and as a result I start to get film algae a lot quicker.
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