Click to expand Tap to zoom Aquaforest Magnesium by Elite Koi Save £-8.75 £8.75 | / 750g - £8.75 4000g - £37.95 750g 4000g Title 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart An agent to maintain constant levels of magnesium in coral reef aquaria. Dissolve 10 g of the product in 1000 ml of deionized water. To maintain ion equilibrium.