High phosphate levels will slow coral growth by preventing skeletal growth and feed algae growth. Maintaining ultra low levels of phosphate will increase coral growth and help prevent algae outbreaks. Phosphate Kit includes: 100 tests Easy-to-use, colorimetric comparator Affordable reagent refills Red Sea produces an algae management line of test kits including nitrate and phosphate test kits. Providing an accurate measurement of these elements allows for proper dosing and control of algae nutrient levels. Red Sea Phosphate Pro Test Kit Includes: 100 tests Accuracy: 0.02 ppm Range: 0-5 ppm Test Type: Color comparator Affordable reagent refills A successful coral reef aquarium depends on how well you maintain the water parameters which are the key to a stable coral environment. Using Red Sea test kits will allow you to accurately measure these levels and guide you on your path to reefing success.