Glossary
Calcium
Ca²⁺. Reef target: 410–450 ppm.
Used by coral for skeletal calcium carbonate. Consumed in tandem with alkalinity at 1:1 molar ratio (20 ppm Ca per 1 meq/L alk).
Recommended
Test kit + DIY two-part chemical.
Salifert Calcium test kit
Pairs with the alk kit for two-part dosing tracking.
View on Amazon →
BRS Pharma Calcium Chloride (Ca component)
Anhydrous CaCl₂ for two-part dosing. Use Randy's recipe math.
View on Amazon →
Affiliate links. As an Amazon Associate, reefcalcs earns from qualifying purchases.
Related
Browse more terms
Last reviewed