Blend of high-purity powdered potassium, an important component of aragonite (the mineral secreted as skeletal material by corals and other reef-building marine organisms), complexed into pigments that enhance blue coloration of some small-polyp stony corals, important to proper neurological function, and depleted in marine aquaria by livestock, May be used to combat potassium depletion that often accompanies the use of zeolite-based filtration methods employed to maintain ultra-low-nutrient aquaria, Considerably stronger and more economical than liquid potassium solutions; created for hobbyists maintaining multiple reef aquaria, Formulated by a marine scientist, Powder, 300-g, SKU: RYLHC1008