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Reef Aquarium Dosing Calculator
Reef Aquarium Dosing Calculator — Brightwell Aquatics Supplements
Getting supplement doses right is critical in a reef aquarium — too little and deficiencies persist, too much and you risk crashing other parameters or stressing corals. This professional dosing calculator handles major trace elements (bromine, boron, fluoride, rubidium), minor trace elements (barium, molybdenum, nickel, vanadium, zinc), and the full range of Brightwell Aquatics -P powder and liquid product lines. Enter your tank volume, current measured values from ICP testing, and target values — and get exact milliliter doses calculated on the fly. No guesswork, no unit conversions needed.
How to Use This Calculator
1
Enter your tank volume in liters or gallons. All doses are recalculated automatically as you type.
2
For each supplement you want to dose, enter the current measured value (from your ICP test or test kit) and your target value.
3
The Dose column updates live — you'll see the exact ml to add. Leave rows blank for supplements you don't need to adjust.
4
Click Generate Dosing Protocol for a complete summary of all doses to administer.
5
Dose one supplement at a time, spaced 30–60 minutes apart. Retest after 24–48 hours before the next round.
Need Brightwell Aquatics supplements?
We stock a curated selection of trace element supplements — check availability on our Brands page.
Frequently Asked Questions
How does the dosing calculation work?
The formula is: Dose (ml) = (Target − Current) × Volume(L) ÷ Solution Concentration × 1000. Each product has a known element concentration in ppm (mg/L) — for example, Brightwell Calcion-P powder, when dissolved per label instructions, yields 65,520 mg/L of calcium. Dividing by this concentration converts the required element mass into a product volume.
What concentration should I use for powder products?
For Brightwell -P powders (Calcion-P, Magnesion-P, Potassion-P, Strontion-P), this calculator uses the standard mixing ratio: 100g powder dissolved in 1 liter of RODI water. The resulting solution concentration is pre-entered. If you mix at a different ratio, the doses will be proportionally different.
Should I dose all supplements at once?
No. Always dose one supplement at a time and wait at least 30–60 minutes between additions. Some elements can precipitate if added together to concentrated doses. For large corrections (raising a parameter by more than 20%), split the total dose across 2–3 days.
When should I use powder vs liquid products?
Powder solutions (-P line) are significantly more cost-effective for large tanks or frequent dosing — you pay for the element, not the water. Liquids are more convenient for small doses and don't require mixing. For daily automated dosing pumps, liquids are often preferred for stability. For monthly manual corrections, powders are more economical.
