tropic marine, tropic marine pro reef if you have cal reactors, there very pricey, i pay 80.00 for a bucket (150 gallon mix), then the one i also use is reef crystals, and instant ocean (40.00 dollars for a 200 gallon box mix) also i use all three of these on certain reef tanks i have, i try to give the best to the SPS, i use the reef crystals and the instant ocean to see results, i love to do my own experiments to see different growth, heath, etc, just learning with what i want to use in near future when i get new home with my 1 ultimate reef tank, somewhere around 2000 to 20,000 gallons, lol.