1st wait a few days and see if you have a sudden outburst of algae. High lighting can get algae growing that wouldn't take off in lower light. If you do see algae growing, you need to work on getting the nutrient levels down in your tank. At 4 mos old, the tank is still very young and will probably have lots of excess nutrients.
Do you have any corals in there now? Soft corals are OK now, but I would wait a few months for the tank to stabilize more before adding any LPS
and I wouldn't add any SPS
till the tank it at least 1 yr old and you have a firm grasp on keeping your calcium, alkalinity and magnesium levels in line.