What are your nitrate and phosphate readings stable at? I was 0/0 undetectable with very little algae growth in my relatively new tank. I don't intend to continue dosing, I'm hoping that additional fish and a heavier feeding schedule will "naturally" get things stable over time. But I was unhappy with everyone commenting how washed out my corals were, so I felt I needed to do this to get these animals what they needed.
I went with potassium nitrate and monopotassium phosphate from Green Leaf:
Shop Potassium Nitrate (KNO3) Aquarium Fertilizer (1lb Bag) for fertilizing your aquarium plants. Brand: Green Leaf Aquariums (GLA). Orders ship fast worldwide and get free shipping on orders $125.
greenleafaquariums.com
Got some of their cheap dosing bottles and added the RODI to it. To raise my nitrate by ~0.5ppm, it's 10mL of the stuff: 3.5tsp per 1000mL
Phosphates be careful dosing. I made this bottle far less concentrated, so 10mL of it raises my 90 gallons by ~0.2ppm: 1 tsp per 1000mL
Great calculator resource here: