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Discus Water Calculators and Tools

These tools manage the water your discus lives in: water change volumes, nitrogen cycle tracking, salinity and parameter checks. All 3 are free, quick and based on discus reference data.

Water3 tools

All 3 discus water tools

Discus Water tools: what they help with

These tools manage the water your discus lives in: water change volumes, nitrogen cycle tracking, salinity and parameter checks. In an aquarium, water quality is everything. Most fish health problems start with ammonia, nitrite or temperature drifting out of range.

What to know about water quality for discus

Discus demand very warm, very clean soft water and near-daily water changes while growing. They are social and should be kept in groups of five or more. This is not a beginner species.

Discus quick facts

Reference values for discus from the species data behind this tool.
MeasureDiscus
Typical lifespan10–15 years
DietCarnivore
Mature atAbout 1.5 years
Clutch size150–300 eggs

A practical tip

Test before you change anything. Correcting a parameter quickly can stress fish more than the problem you were trying to fix.

Other discus topics

Discus care rarely sits in one box. You may also find these useful: discus age tools, discus behavior tools, discus breeding tools and discus cost tools. Or see every discus tool in one place.

Water tools for other pets

The same kind of tool exists for other species, each using that animal's own reference data: goldfish water, betta fish water, guppy water and molly water.

Frequently asked questions

How often should I change my discus's water?

It depends on tank size, stocking and filtration. The water change calculator suggests a volume and schedule, which your test results should then confirm.

Which discus water tool should I use first?

Most people start with the Discus Nitrogen Cycle Tracker, the most used tool in this group. If your question is more specific, the list above describes what each of the 3 tools does.

How accurate are the results?

They are estimates based on published reference data for discus, and each tool lists its sources. Individual animals vary, so treat results as a guide and check health decisions with your vet.