Beginner

Use 6 g (1 level teaspoon) per 150 L (40 gallons) twice a week. May be added directly to aquarium. For precise dosing, use the Seachem Digital Spoon Scale.

Advanced

Check strontium level (use Reef Status™ Strontium to test strontium levels), then follow addition regimen above until strontium is adjusted to 8–12 mg/L. Each 6 g/150 L will raise strontium by about 2 mg/L. Amount or frequency can be adjusted as needed. Thereafter, use as required to maintain strontium.

Expert

After determining the strontium depletion rate, set up a continuous drip system. Use the following formula (or skip the math and use our Dosage Calculator) to determine how much to add to your top-off water: m=vs/30 (m=grams to add to top off water, v=volume of tank in liters, s=amount to raise strontium in mg/L). For example, if you want to raise strontium by 6 mg/L in a 200 L aquarium, then you would add (200x6)/30=40 g into the top-off water. [For reference: 1 gallon = 3.8 liters]. Use the Reef Status™: Strontium test kit to check strontium levels.

DO NOT OVERDOSE: Excess strontium may enhance the loss of carbonate alkalinity. Do not directly mix with any carbonate supplement. Best if strontium & carbonate additives are added on alternate days or at least 30 minutes apart.