Aquascaping Fertilizer Calculator

Estimate weekly planted-tank nutrient targets, all-in-one dosing cadence, monthly bottle usage, and algae risk from tank size, plant load, light, and CO2.

Last updated: 2026-03-16

Aquascaping fertilizer calculator

Enter your values

Estimate weekly nutrient targets, an all-in-one dosing cadence, monthly bottle usage, and algae risk for a planted aquarium.

Per-Dose Target

Enter your tank size, plant load, and fertilizer bottle details to estimate a weekly dosing plan.

Calculation History (0)

No calculations yet. Complete a calculation to see it here.

Example calculations

Tap an example to prefill the calculator with sample values.

Low-tech community tank

20 gallons, medium plants, no injected CO2

A practical all-in-one dosing plan for a low-maintenance planted tank.

Result: 3 doses per week with modest nutrient targets and low algae risk

High-tech stem tank

40 gallons, high plants, CO2 and high light

A fast-growth setup that needs heavier, more frequent dosing.

Result: Heavier dose cadence with moderate algae risk if consistency slips

Nano moss tank

10 gallons, low plants, low light

A slower tank where gentle dosing keeps growth steady without waste.

Result: Small doses with low nutrient demand and low algae risk

Balancing nutrients with growth demand

Faster tanks do not just need more fertilizer. They need more consistency. The estimate here combines plant load, light intensity, and injected CO2 so the dose cadence matches how aggressively the tank is likely to pull nutrients.

If algae pressure is high, look for imbalances rather than only lowering nutrients. Too much light, unstable CO2, and skipped maintenance often create the bigger problem.

Aquascaping fertilizer FAQs

A quick primer on using the dosing estimate and reading the algae-risk output.

Why does the calculator ask about CO2 and light?

Faster-growing tanks generally consume nutrients more aggressively. Light intensity and injected CO2 are two of the biggest signals for how demanding the setup is likely to be.

Are these ppm targets tied to one specific fertilizer method?

No. They are practical estimate ranges inspired by common planted-tank approaches, translated into an all-in-one bottle workflow so they are easier to use day to day.

Can this replace testing and observation?

Not completely. Plant growth, algae, and livestock response still matter. Use the calculator as a starting lane, then adjust based on how your tank actually behaves over time.

Pair nutrient planning with plant-light estimates for a more balanced setup.

Plant Light Calculator

Estimate PPFD and DLI so dosing and light stay in the same ballpark.

Sourdough Feeding Calculator

Another hobby planning tool built around timing and environmental conditions.

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Disclaimer

This calculator provides general estimates for hobby projects. Results may vary based on specific conditions, materials, and techniques.

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