That bulb could do it. As soon as light is below 10,000K it will promote algae. Algae loves that light. Personally, I don't believe bulbs under 10,000K belong on a reef - they are for refugiums imho. You cuold try switching to a higher Kelvin, but now that the problem has presented itself you will probably have to do more than just change bulbs. The problem was waiting to happen anyway, and it sounds like the new low Kelvin bulb tipped the scale.
Waterchanges will only go so far. GFO is a must imo. A good skimmer will help a lot, along with a filter sock in the sump. If you don't have a skimmer and a sump get one of those filer baskets you can put on a MaxiJet, hook it up to a MJ and use some bulk sheets of filter media. Cut them a little over-sized, wrap them around the filter basket, and use elastic bands at the top and bottom to secure them. This is like making a DIY filter sock and really helps when you are having algae issues.
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~ Mindy
SPS fanatic.
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