Seachem Reef Strontium 250 mL – Reef Aquarium Strontium Supplement
Seachem Reef Strontium 250 mL is a concentrated strontium supplement formulated for marine and reef aquariums. It helps restore and maintain strontium near the levels found in natural seawater, supporting corals, coralline algae, clams, and other organisms that produce calcium-based skeletons or shells.
Reef Strontium uses gluconate-complexed strontium for aquarium supplementation. It is especially useful in established or densely stocked reef systems where strontium is gradually consumed through coral growth and calcification.
Key Features
- Concentrated Strontium Supplement: Contains 10,000 mg/L of strontium for marine and reef aquariums
- Supports Calcifying Organisms: Helps maintain strontium used by stony corals, coralline algae, clams, and other calcifying livestock
- Maintains Natural Seawater Levels: Designed to restore and maintain strontium within an appropriate reef-aquarium range
- Gluconate-Complexed Formula: Provides strontium in a soluble supplement designed for reef aquarium use
- Routine Reef Supplementation: Useful in systems where coral growth steadily consumes available strontium
- Convenient 250 mL Bottle: Suitable for nano, medium, and regularly maintained home reef aquariums
Product Information
- Brand: Seachem
- Product: Reef Strontium
- Size: 250 mL
- Product Type: Reef aquarium strontium supplement
- Concentration: 10,000 mg/L strontium
- Strontium Source: Gluconate-complexed strontium
- Aquarium Type: Marine and reef aquariums
- Recommended Strontium Range: Approximately 8–12 mg/L
- Beginner Dosage: 5 mL per 20 gallons twice weekly
Best Used For
- SPS coral aquariums
- LPS coral aquariums
- Mixed reef systems
- Coralline algae growth
- Tridacnid clam systems
- Densely stocked reef aquariums
- Reef tanks with confirmed low strontium
- Routine supplementation between water changes
- Systems with steady calcium-carbonate growth
Beginner Dosing Directions
Use one capful, or 5 mL, of Seachem Reef Strontium for every 20 US gallons of aquarium water twice weekly.
Each 5 mL dose per 20 gallons raises strontium by approximately 0.6 mg/L. Adjust the quantity or dosing frequency as needed to maintain an appropriate strontium concentration.
Calculate dosage using the aquarium’s actual water volume after accounting for displacement from rock, substrate, decorations, and equipment.
Advanced Dosing Directions
Test the aquarium’s strontium level before making significant adjustments. Follow the standard dosing schedule until strontium reaches approximately 8–12 mg/L.
Once the desired concentration has been reached, adjust the dose or frequency according to the aquarium’s measured consumption rate. Densely stocked reef aquariums and systems with rapid coral growth may consume strontium more quickly.
Make large corrections gradually to reduce the risk of exceeding the intended level.
Approximate Dosing Guide
- 10-Gallon Aquarium: Approximately 2.5 mL twice weekly
- 20-Gallon Aquarium: 5 mL twice weekly
- 40-Gallon Aquarium: 10 mL twice weekly
- 55-Gallon Aquarium: Approximately 13.75 mL twice weekly
- 75-Gallon Aquarium: Approximately 18.75 mL twice weekly
- 100-Gallon Aquarium: 25 mL twice weekly
These amounts are proportional calculations based on Seachem’s beginner dosage. Test regularly and follow the current instructions printed on the bottle.
Why Strontium Matters
Strontium is chemically similar to calcium and is incorporated into the skeletons and shells of many marine organisms. Natural seawater generally contains approximately 8–10 mg/L of strontium.
Corals, coralline algae, clams, and other calcifying organisms may gradually remove strontium from aquarium water as they grow. Maintaining an appropriate concentration helps provide these organisms with a continued supply.
Using Strontium with Calcium & Alkalinity Supplements
Strontium supplementation complements, but does not replace, calcium and alkalinity management. Reef-building corals require stable calcium, alkalinity, magnesium, salinity, temperature, and nutrient levels in addition to trace and minor elements.
Test calcium and alkalinity regularly and maintain them within an appropriate range for the livestock being kept. Do not rely on Reef Strontium to correct low calcium, low alkalinity, or unstable pH.
When using multiple supplements, add them separately according to their labels. Avoid directly mixing concentrated aquarium supplements together unless the manufacturer specifically permits it.
Dosing Tips
- Shake the bottle before use if instructed on the label
- Measure dosage according to actual aquarium water volume
- Use a dosing syringe for amounts smaller than one capful
- Add the supplement to an area with good water movement
- Test strontium before making large adjustments
- Increase low strontium gradually rather than with one large dose
- Keep a log of test results and dosing amounts
- Adjust dosage according to measured aquarium consumption
- Continue regular water changes and routine reef maintenance
Important Reef Aquarium Note
Strontium should not be dosed excessively or based only on coral appearance. Pale coloration, reduced growth, tissue loss, or poor polyp extension can be caused by many factors and do not independently confirm a strontium deficiency.
Before increasing supplementation, review salinity, temperature, calcium, alkalinity, magnesium, nitrate, phosphate, lighting, water flow, pests, and overall aquarium stability.
More strontium does not necessarily produce faster coral growth. Test when possible and dose conservatively to avoid exceeding the desired range.
Frequently Asked Questions
What is Seachem Reef Strontium used for?
Reef Strontium is used to restore and maintain strontium in marine and reef aquariums containing corals, coralline algae, clams, and other calcifying organisms.
How much Reef Strontium should I use?
Use 5 mL for every 20 US gallons twice weekly as the beginner dosage.
How much does one dose raise strontium?
A dose of 5 mL per 20 gallons raises strontium by approximately 0.6 mg/L.
What strontium level should I maintain?
Seachem recommends adjusting and maintaining strontium at approximately 8–12 mg/L.
What is the natural seawater strontium level?
Natural seawater generally contains approximately 8–10 mg/L of strontium.
Does 5 mL per 20 gallons raise strontium by 1 ppm?
No. Seachem states that 5 mL per 20 gallons raises strontium by approximately 0.6 mg/L.
Why is strontium important in reef aquariums?
Strontium is incorporated into the calcium-based skeletons and shells of many corals, coralline algae, clams, and other marine organisms.
Do water changes replace strontium?
Water changes may replace some strontium, depending on the salt mix and water-change schedule. Densely stocked or rapidly growing reef systems may still consume strontium faster than it is replaced.
Can Reef Strontium be used in mixed reef aquariums?
Yes. It may be used in mixed reef systems when dosed according to the label and maintained within an appropriate concentration range.
Can too much strontium be harmful?
Excessive supplementation may push strontium above the intended level. Test when possible, make large adjustments slowly, and avoid unnecessary overdosing.
Does Reef Strontium replace calcium and alkalinity supplements?
No. Strontium is a separate element and does not replace calcium, alkalinity, magnesium, or complete reef aquarium maintenance.
Should I test before dosing?
Routine beginner dosing may be used according to the label, but testing is strongly recommended when adjusting the dose, correcting a suspected deficiency, or maintaining a heavily stocked reef system.
Available at Tropical Treasures Wyo
Seachem Reef Strontium 250 mL helps restore and maintain strontium for corals, coralline algae, clams, and other calcifying reef organisms. Visit Tropical Treasures Wyo in Cheyenne, Wyoming, to shop Seachem reef supplements, calcium and alkalinity products, marine test kits, dosing supplies, reef foods, and aquarium care essentials.
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