Reef Foundation ABC+: Contains Calcium, Strontium, Barium, Bicarbonates, Magnesium, Potassium, Boron, Iodine, and Bromine formulated according to the exact ratio found in the coral skeleton. This unique powder supplement simplifies the daily dosing of more than just the foundation elements, and is recommended for aquariums of up to about 300 liters / 75gallons.   1 Kg or 5 Kg sizes available