A little less guesswork.
APT 3 (Complete) calculator
2Hr Aquarist APT 3 / Complete — current standard daily directions
Read the product guide and worked examples ↓
Clear amounts. Visible assumptions.
Your calculation, explained
Choose a product and enter the water you’re actually dosing.
- Check the exact product and formulation.
- Use measured water, or make an explicit estimate.
- Review the amount, source and any schedule.
Product guide · edited 28 October 2026
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What is the current standard APT 3 dose?
The current standard reference is 3 mL per 100 L daily. The manufacturer directs aquariums without CO₂ or dominated by slow-growing/shade plants to its adjustment guidance. The tool scales the standard only.
Worked examples
These illustrations use 100 L of measured water, without a decor deduction. Choose the matching stage or formulation above for your own water volume. They do not select a treatment or establish livestock suitability.
Daily
| Stage | Amount or action for 100 L |
|---|---|
| Daily | 3 mL |
Example only. Your calculation above uses your own inputs. Small amounts and powder fractions still need equipment that can measure them reliably.
Before you measure
Follow the current daily plan rather than combining it with the former four-times-weekly recipe. Use measured water without a second decor deduction.
Product-specific checks from the calculation record
- The current standard is 3 mL per 100 L daily. Tanks without CO₂ or with mostly slow growers should use the manufacturer’s adjustment guidance.
- The former 5 mL four-times-weekly recipe is not used by this record.
Can I add seven daily amounts once a week?
Seven times the daily amount is a numerical total, not permission for a single weekly application. Keep to the applicable manufacturer routine.
Sources and next steps
2Hr Aquarist manufacturer directions →
Manufacturer page consulted 28 October 2026. Match the exact bottle and leaflet; editorial review does not establish diagnosis or compatibility.