Kent Marine Strontium and Molybdenum, 16oz. Strontium and Molybdenum Supplement provides bio-available strontium for lush growth of purple, pink and green calcareous algaes, snails, hard tubeworms and clams. Magnesium, potassium and molybdenum are added to assist the symbiotic algae growing in coral and other invertebrate's tissues. Corals will open more and stay attached to their skeletons better, with regular use. Phosphate and nitrate free! Contains no gluconates. EDTA, or other organics to raise DOC levels, as may competing products do. For best results, use Kent Kalkwasser Mix, or Concentrated Liquid Calcium first. Directions: Add one teaspoon (capful or 5 ml) per 50 gallons (190 l) of tank capacity. Adding more than the recommended amount of Strontium and Molybdenum Supplement is generally very safe and can be beneficial in many cases, particularly when you have heavy animal loads. If you decide to increase the dosage, just read the cautions on the bottle, and cut back should any adverse reactions be noticed.