.aq-pd { font-family: Georgia, serif; color: #1a1a1a; max-width: 860px; margin: 0 auto; line-height: 1.7; } .aq-pd h2 { font-size: 1.45em; font-weight: 700; letter-spacing: -0.01em; border-left: 4px solid #006064; padding-left: 12px; margin: 2em 0 0.6em; } .aq-pd h3 { font-size: 1.05em; font-weight: 700; margin: 1.2em 0 0.4em; color: #006064; text-transform: uppercase; letter-spacing: 0.06em; font-family: Arial, sans-serif; } .aq-pd p { margin: 0.5em 0 1em; } .aq-callout { background: #003c3f; color: #fff; border-radius: 4px; padding: 16px 20px; margin: 1.6em 0; font-family: Arial, sans-serif; font-size: 0.93em; line-height: 1.6; } .aq-callout strong { color: #A7FFEB; } .aq-features { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; margin: 1em 0 1.6em; } .aq-feature-card { background: #E0F7FA; border-radius: 4px; padding: 14px 16px; border-left: 3px solid #006064; font-family: Arial, sans-serif; font-size: 0.9em; } .aq-feature-card strong { display: block; margin-bottom: 3px; color: #1a1a1a; } .aq-feature-card span { color: #555; } .aq-compare { overflow-x: auto; margin: 1em 0 1.6em; } .aq-compare table { width: 100%; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 0.88em; min-width: 520px; } .aq-compare th { background: #006064; color: #fff; padding: 9px 14px; text-align: center; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; } .aq-compare th:first-child { background: #003c3f; text-align: left; } .aq-compare td { padding: 8px 14px; border-bottom: 1px solid #d0e8ea; text-align: center; } .aq-compare td:first-child { text-align: left; font-weight: 600; color: #444; background: #f5fbfc; } .aq-compare tr:nth-child(even) td:not(:first-child) { background: #f0fafb; } .aq-specs-table { width: 100%; border-collapse: collapse; margin-top: 1em; font-family: Arial, sans-serif; font-size: 0.93em; } .aq-specs-table th { background: #003c3f; color: #fff; text-align: left; padding: 9px 14px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; font-size: 0.82em; } .aq-specs-table td { padding: 8px 14px; border-bottom: 1px solid #e5e5e5; vertical-align: top; } .aq-specs-table tr:nth-child(even) td { background: #f7fcfd; } .aq-specs-table td:first-child { font-weight: 600; width: 45%; color: #444; } .aq-tab-radio { display: none; } .aq-tab-labels { display: flex; flex-wrap: wrap; gap: 8px; margin: 1.4em 0 0; } .aq-tab-label { display: inline-block; padding: 10px 22px; border: 2px solid #006064; background: #fff; color: #006064; font-weight: 700; font-family: Arial, sans-serif; font-size: 0.9em; cursor: pointer; border-radius: 3px; letter-spacing: 0.04em; transition: background 0.15s, color 0.15s; user-select: none; } .aq-tab-label:hover { background: #B2EBF2; } .aq-tab-panel { display: none; } #aq-tab-250:checked ~ .aq-tab-labels label[for="aq-tab-250"], #aq-tab-500:checked ~ .aq-tab-labels label[for="aq-tab-500"], #aq-tab-1000:checked ~ .aq-tab-labels label[for="aq-tab-1000"], #aq-tab-5000:checked ~ .aq-tab-labels label[for="aq-tab-5000"] { background: #006064; color: #fff; } #aq-tab-250:checked ~ .aq-panels #aq-panel-250, #aq-tab-500:checked ~ .aq-panels #aq-panel-500, #aq-tab-1000:checked ~ .aq-panels #aq-panel-1000, #aq-tab-5000:checked ~ .aq-panels #aq-panel-5000 { display: block; } .aq-note { font-family: Arial, sans-serif; font-size: 0.82em; color: #777; margin-top: -0.5em; font-style: italic; } Quantum Aragonite A is a concentrated liquid calcium supplement and the first part of Quantum's three part Aragonite reef dosing system. Calcium is one of the building blocks your corals, clams, and coralline algae pull from the water every day to grow new skeleton and shell. Aragonite A replaces it in a clean, reef safe form so your tank never runs short. Pair it with Aragonite B (Alkalinity) and Aragonite C (Magnesium) for complete, stable chemistry, and explore the rest of our reef additives and supplements. Calcium never works alone. Calcium, alkalinity, and magnesium move together in a reef tank. Dose Aragonite A alongside B and C and test regularly to keep all three locked in their target ranges. That balance is what keeps coral growth steady and color bright. Why Calcium Matters Stony corals (SPS and LPS), clams, snails, and coralline algae all build their structures from calcium carbonate. A growing reef can pull calcium down quickly, and when it drops, growth slows and tips can pale or recede. Aragonite A lets you hold calcium in the ideal 420 to 440 ppm range. Magnesium (Aragonite C) keeps that calcium and your alkalinity in solution, and alkalinity (Aragonite B) supplies the carbonate side of the equation, which is why the three are dosed as a set. Features Concentrated CalciumA strong, efficient calcium source that goes a long way per drop. Reef Safe FormulaClean ingredients formulated specifically for marine and reef aquariums. Part of a 3-Part SystemWorks hand in hand with Aragonite B (Alkalinity) and C (Magnesium). Built for CalcifiersSupports SPS, LPS, clams, and coralline algae growth. Made in AustraliaProduced by Quantum to a consistent, lab tested standard. Four SizesFrom a 250 ml nano bottle to a 5 L jug for large or multiple reefs. Choose Your Size Select a size in the tab section below for its full detail sheet. Spec 250 ml 500 ml 1 L 5 L Volume 250 ml 500 ml 1000 ml 5000 ml Best For Nano / pico reefs Small reefs Mid size reefs Large or multiple reefs Value per ml Good Better Great Best SKU AA250 AA500 AA1000 AA5000 Price $22.49 $30.49 $44.99 $139.99 Detailed Size Specifications Click a size below to view its full sheet. 250 ml · Nano 500 ml · Small 1 L · Mid 5 L · Large 250 ml · Nano & Pico Reefs The starter bottle. Ideal for nano and pico reefs, or for trying the Aragonite system before committing to a larger jug. Specification Value Volume 250 ml SKU AA250 Role Calcium (Part A) Best For Nano and pico reef tanks Price $22.49 500 ml · Small Reefs A practical everyday size for small reef systems with a light to moderate calcium demand. Specification Value Volume 500 ml SKU AA500 Role Calcium (Part A) Best For Small reef tanks Price $30.49 1 L · Mid Size Reefs The best balance of value and shelf life for most established reef tanks with steady coral growth. Specification Value Volume 1000 ml (1 L) SKU AA1000 Role Calcium (Part A) Best For Mid size reef tanks Price $44.99 5 L · Large or Multiple Reefs The bulk jug for large, heavily stocked SPS systems or hobbyists running several reef tanks. The lowest cost per ml. Specification Value Volume 5000 ml (5 L) SKU AA5000 Role Calcium (Part A) Best For Large or multiple reef tanks Price $139.99 Which Size Is Right for You? 250 ml — Nano and pico reefs, or a low commitment way to start the Aragonite system. 500 ml — Small reefs with a light to moderate calcium draw. 1 L — The sweet spot for most mid size reefs. Best mix of value and freshness. 5 L — Large SPS systems or multiple tanks where you want the lowest cost per ml. How to Dose Always test before you dose. Use a quality calcium test kit, then add Aragonite A to bring calcium into the 420 to 440 ppm range, raising it no more than about 50 ppm per day. Once you hit your target, dose a small daily amount to replace what your corals consume. Follow the dosing guide on the bottle and adjust to your own test results. Keep calcium, alkalinity, and magnesium in balance by dosing Aragonite A, B, and C together, and pick up a reliable kit from our water testing collection. FAQ Do I have to use all three Aragonite products?For a thriving reef, yes. Calcium, alkalinity, and magnesium are consumed together and depend on each other. Dosing only calcium will eventually pull the other two out of range. What calcium level should I aim for?Most reef keepers target 420 to 440 ppm. Test, then dose Aragonite A to reach and hold that range. Can I use this in a fish only saltwater tank?You can, but the main benefit is for reef tanks with corals, clams, and coralline algae that actively use calcium. How is this different from Quantum Easy E Calcium?Aragonite A is the single calcium component of the three part Aragonite system. Easy E Calcium is part of a simpler two part approach. Both raise calcium; choose the system that fits how you like to dose.
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