Calcium in Reef Tanks
Aragonite A Calcium
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Step 3 — Aragonite Enhancers / Aragonite A™
Reef Essential® · Aragonite Enhancer
The "C" in CAM — ionic and complexed calcium.
Aragonite A™ provides ionic and complexed calcium plus strontium and barium — the building blocks corals use for dense, stable aragonite skeleton. Use alongside Aragonite B and C for the full major, minor, and trace element profile.
Too much or too little both cause problems
Too much calcium and alkalinity tends to drop, weakening your water's buffering capacity and causing fluctuations that can lead to coral tissue detachment. Too little calcium and coral growth slows, with knock-on instability across other elements. Aragonite A, dosed alongside B and C, is designed to keep calcium in the target range without needing to think about it constantly.
When aragonite elements run low, corals can form brittle calcite instead of dense aragonite — leading to lower bone density and slower growth overall.
What's in the bottle
Contents
Deionized water plus calcium, strontium, and barium.
Use as a team
Must be used alongside Aragonite B and C to provide the full major, minor, and trace aragonite element profile.
Directions
Shaking isn't required, though inverting 3–4 times helps if it's been sitting a while. Add to high water flow; safe on a dosing pump.
Powder option
Also available as bulk powder, formulated with Aragonite B powder for a 1:1 dosing ratio — mix 110g per liter, then dose ½ capful (5mL) of the resulting solution.
Reef aquariums only
Formulated for reef tanks, not general saltwater setups without coral.
Want more color?
For coral tissue color and growth beyond CAM, pair with Step 4's Bioactive Color Intensifiers™.
Dosing guide
1 mL/100L (26 gal) raises calcium by roughly 2 ppm; other elements increase relatively.
| Stocking level | Dose |
|---|---|
| Lightly stocked | 0.50 mL/day per 100L (26 gal) |
| Moderately stocked | 0.75 mL/day per 100L (26 gal) |
| Heavily stocked | 1.00 mL/day per 100L (26 gal) |
| Or as required | to maintain 405–440 ppm calcium |
Questions about this product
Can I use Aragonite A by itself?+
What's the difference between the liquid and powder?+
Can I use this on a dosing pump?+
Not sure how much you need?
The dosing app calculates exact amounts for your tank size and calcium reading.
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