Provide the proper amount of calcium your reef system needs with Kent Marine Liquid Calcium Marine Aquarium Supplement. Proper amounts of calcium enhance the growth of purple， pink and green calcareous algaes， snails， hard tube worms and clams. It also helps corals open more and stay attached to their skeletons. Kent Marine Liquid Calcium Marine Aquarium Supplement provides bio-available calcium to promote this growth with long-term results. It contains no phosphates， nitrates， gluconates， EDTA or other organics that can raise DOC levels. While Kent Marine Liquid Calcium Marine Aquarium Supplement alone provides all the calcium your reef will need， it is recommended for use with Kent Kalkwasser Mix for best results.