Seachem Reef Advantage Strontium

Seachem Reef Advantage Strontium restores strontium to natural seawater levels, helping prevent ionic imbalance in reef tanks.

Reef Advantage Strontium restores and maintains strontium to levels found in natural sea water. Strontium is utilized by corals in the same manner as calcium and holds a similar importance in maintaining a vigorous level of growth. It is most useful in densely populated aquariums requiring a continuous supply of strontium. Reef Advantage Strontium is a highly concentrated (30,000 ppm), ionically balanced strontium supplement. Strontium occurs in natural seawater at a concentration of about 8 to 10 mg/L. It is chemically very similar to calcium, and many organisms incorporate it in their skeletons along with calcium. Its addition to reef aquariums aids the growth of corals, coralline algae and other organisms that lay down a calcereous skeleton or shell, including tridacnid clams.

Sizes: 300 gm

Unlike other strontium chloride products, Reef Advantage Strontium is formulated so that it can be added directly to the aquarium. Competing products require one to mix a separate solution before adding it to the system.

BEGINNER: Use 8 g (1 level teaspoon*) per 150 L (40 gallons*) twice a week. May be added directly to aquarium. ADVANCED: Check strontium level, then follow addition regimen above until strontium is adjusted to 8-12 mg/L. Each 8g/150L 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 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 liter aquarium, then you would add (200x6)/30=40 g into the top-off water. [For reference: 1 gallon* = 3.8 liters]. Notes: Use the Reef Status: Strontium 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.

Part of maintaining stable reef chemistry — see our guide to KH (Alkalinity) for why this parameter is tracked closely alongside calcium and magnesium.

Part of maintaining stable reef chemistry — see our guide to Calcium & Magnesium for how this product fits into dosing a reef tank.

Compatibility

Marine and reef. Do not mix it directly with any carbonate supplement — dose strontium and carbonate on alternate days, or at least 30 minutes apart, since excess strontium drives carbonate alkalinity down.

Unlike plain strontium chloride it can go straight into the tank without pre-mixing.

Freshness & Storage

Every batch we dispatch carries a minimum of 6 months' remaining shelf life. Store this product in a cool, dry place away from direct sunlight, with the cap or inner foil closed tightly after each use.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number — or email us, if you would rather — and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 72 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.