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API Stress Coat calculator

API Stress Coat standard aquarium conditioner — US directions

Read the product guide and worked examples ↓

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API Stress Coat standard aquarium conditioner — US directions

Choose explicitly; different uses or formulations may have different quantities. Use only the water volume specified for that choice.

Water volume

Actual water amount; no decor deduction.

litres

Supports 3.8–100,000 L after displacement. These are software limits, not livestock safety limits.

Review and calculate

Check the product label, water volume and units.

How calculations work

Calculation inputs stay in this page’s URL so Back and Edit can retain them. Saving tanks or a treatment plan on your device is separate and optional.

Clear amounts. Visible assumptions.

Your calculation, explained

Choose a product and enter the water you’re actually dosing.

  1. Check the exact product and formulation.
  2. Use measured water, or make an explicit estimate.
  3. Review the amount, source and any schedule.
Read our calculation method →

Product guide · edited 28 October 2026

Jump to a section
  1. Conditioning water or supporting damaged skin?
  2. Worked examples
  3. Before you measure
  4. Should every water change use the doubled amount?
  5. Sources and next steps

Conditioning water or supporting damaged skin?

The US label has separate standard and doubled skin/fin-support amounts. For conditioning, enter the new water; for the skin/fin application, enter the whole aquarium water volume.

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.

Standard water-conditioning amount

StageAmount or action for 100 L
When adding / changing water13.21 mL

Label amount for slime-coat / damaged skin and fins

StageAmount or action for 100 L
Label skin / fin-support use26.42 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

Select the purpose deliberately. API does not recommend this product with a protein skimmer. A skin-support mode is not a diagnosis of why a fish is unwell.

Product-specific checks from the calculation record
  • Select the label purpose rather than automatically doubling a routine water-conditioning amount. This is a water conditioner, not a diagnosis or a substitute for disease treatment.
  • These quantities follow the manufacturer’s US label. If your bottle gives different reference volumes or strengths, use that label and request its specific variant.

Should every water change use the doubled amount?

The doubled label amount has a different purpose. It is not the automatic standard for replacement-water conditioning.

Sources and next steps

API manufacturer directions →

Manufacturer page consulted 28 October 2026. Match the exact bottle and leaflet; editorial review does not establish diagnosis or compatibility.

Optional buying links

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API Stress Coat, 8 fl oz

View on Amazon US (affiliate link) — API Stress Coat, 8 fl oz; opens in a new tab

Check the selected bottle, formulation and label before buying. These links do not select a treatment or change your dose. Prices, sellers and availability are shown on Amazon. About these links.