I would start by adding clean up crew to help you get a head start. Turbo snails. Trochus snails, nassarius snail( they don’t eat algae, but help you clean up excess food), emerald crab, or astrea snails. This problem will go away slowly with age of the tank, and this is common among new tanks. As your tank matures, more things will fight for that excess nutrient. Which will reduce your algae growth.