Seachem MultiTest - Reef SpecialMultiTest Reef Special Combines the Phosphate, Silicate, and Iodine Iodide kits Multi cavity plate for simultaneous testing of up to 6 tests at the same time Includes reference for test validation Saltwater and Reef This kit combines the Silicate, Phosphate, and Iodine Iodide kits into one kit. MultiTest Reef Special performs over 75 tests and contains reference samples for validation. Silicate The silicate test measures silicates to less than 0. 5 mg