Aquarium dosing handbook: from bottle to treatment record
By Richard James · Calculation and editorial review · 28 October 2026
Use this handbook as a route through a dosing decision. It helps organise the information; it does not choose a medicine, diagnose a fish or validate a combination.
Jump to a section
1. Identify the instructions
Write down the exact bottle and formulation. Read the supplied directions, including livestock and equipment restrictions. The label-reading guide explains which details must travel with the numerical reference.
2. Choose the relevant water
Decide whether the instructions concern replacement water, the aquarium or a separate treatment system. Choose a volume method and make any estimate visible. Do not deduct decor twice from measured water.
3. Calculate and inspect
Select the exact product calculator. Check the mode, units, day labels and warnings. A dose and an action such as testing or changing water are separate instructions. The result does not establish that the aquarium is suitable for the product.
4. Check combinations and exceptions
Read every involved product's compatibility restrictions. A standard amount cannot select an emergency course, a species multiplier or a repeat treatment. Ask the maker about an unclear instruction before applying it.
5. Record what actually happened
Save the time, amount actually added, water changes, other products, observations and test results. A copied calculator result alone is not a treatment record. Read how calculations and tests differ.
What this handbook replaces
The former homepage's generic dosing recipes and escalation shortcuts have been removed. Use a product-specific source and a documented assumption instead of a universal emergency multiplier or a guaranteed recovery timeline.
Method and review scope
Reviewed 28 October 2026 against the published calculation methodology and the linked product-specific guides. Calculation and editorial review; examples are arithmetic, not treatment or livestock-safety prescriptions.