Brightwell Aquatics Calcion - Concentrated Ionic Calcium Supplement for Reef Saltwater Aquariums Supports Coral Growth Aragonite Formation No

Brightwell Aquatics Calcion is a precision-formulated ionic calcium supplement designed to restore and maintain calcium levels in reef aquariums. Calcium is a vital component of aragonite, the mineral that forms the skeletons of corals, clams, tube worms, and other reef-building invertebrates. Maintaining calcium between 412–450 ppm allows for optimal coral growth and health, assuming other conditions such as alkalinity, magnesium, and lighting are within ideal ranges. Calcion is significantly stronger than most competing brands and contains no unwanted additives such as EDTA, gluconate, or polygluconate—ensuring a clean, reliable dose every time. It’s phosphate- and silicate-free and designed with purified water and lab-grade materials. This highly concentrated liquid makes dosing easy and accurate. Whether you're running a nano reef or a large-scale coral system, Calcion provides the ionic calcium reef tanks need to thrive. Regular use supports skeletal development and overall stability in marine aquariums.

Highlights: BOOSTS CORAL GROWTH AND STRUCTURE Delivers essential ionic calcium to support rapid coral, clam, and reef invertebrate skeletal development and strength. HIGHLY CONCENTRATED FOR MAXIMUM EFFECTIVENESS Over 50% stronger than most competitors—maintains calcium between 412–450 ppm for vibrant reef aquariums. PURE FORMULA WITHOUT ORGANICS OR BINDERS Free of phosphate, silicate, EDTA, gluconate, and polygluconate for clean, effective marine water chemistry management. FORMULATED BY MARINE EXPERTS Made with ultra-pure water and lab-grade ingredients—backed by marine science and real aquarium testing. AMERICAN-MADE EXCELLENCE – Brightwell Aquatics is an industry-leading brand committed to providing innovative and scientifically backed aquatic care products. Made in the USA, we consistently deliver advanced superior quality solutions to elevate the vibrancy and health of your aquarium.

Key details: Item Weight: 1 Pounds | Customer Reviews: 4.6 4.6 out of 5 stars (86) 4.6 out of 5 stars | Item Package Dimensions L x W x H: 7.64 x 2.28 x 2.2 inches | Item Dimensions LxWxH: 1 x 1 x 1 inches | Brand Name: Brightwell Aquatics | Target Audience Keyword: Fish, algae-eaters | Directions: Basic Use: Shake well. Add 5 ml per 50 gallons every other day to maintain 412–450 ppm calcium. Advanced Use: Test calcium levels before dosing. Shake well before each use. 1 ml raises calcium by 40 ppm per 1 gallon. If calcium is low, dose up to 10 ml per 20 gallons daily. After reaching desired level, measure daily drop in calcium. Divide calcium drop by 40, then multiply by system volume for daily dose in ml. Daily dosing gives more stable calcium levels than weekly dosing. Always maintain calcium within +/-10 ppm for best results. | Model Name: Calcion | Size: 500-ml | Age Range Description: All Life Stages

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Customer feedback: 4.6/5 average rating.

Review snippets: Been using their products for years, everything is pharmaceutical grade Read more / Love this one for sure Read more