This tool provides a general estimate and does not replace professional veterinary advice.
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What is the Angelfish Stocking Level Calculator?
The Angelfish Stocking Level Calculator calculates how many angelfish can safely be stocked in a given tank size. Undersized housing is one of the most common and most fixable welfare problems in pet keeping, it affects everything from stress levels to exercise to litter/waste management.
A well-cared-for angelfish usually lives somewhere between 8 and 10 years. As an omnivore, what an angelfish needs from its diet changes across its life stages. Angelfish are tall-bodied cichlids needing a deep tank of at least 110 liters, not a standard shallow one. They become territorial as they pair off and will eat small tankmates such as neon tetras. Keep an eye out for hole-in-the-head disease, ich, fin rot. These are the conditions angelfish are most commonly seen for.
Angelfish quick facts
| Measure | Angelfish |
|---|---|
| Typical lifespan | 8–10 years |
| Diet | Omnivore |
| Mature at | About 9 months |
| Clutch size | 200–400 eggs |
How does the Angelfish Stocking Level Calculator work?
The recommendation is based on published care-guide minimums for angelfish, scaled to the animal's current or expected adult size. It is a starting point, not a verdict. Somebody who has actually examined your angelfish will always know more than a formula does.
What changes the answer
- Adult size: housing should be sized for the animal's full-grown dimensions, not its current size if still young
- Number of animals being housed together, since space needs don't simply divide evenly
- Activity level and natural behavior, such as climbing, digging or swimming space
- Whether the space is temporary (travel/carrier) or permanent (everyday housing)
How do you use the Angelfish Stocking Level Calculator?
- Enter the tank volume in whichever unit you use (US gal, L, UK gal)
- Enter the adult body length in whichever unit you use (in, ft, cm)
- Pick your filtration and planting (Standard filter, no live plants, Strong filter or heavily planted, Minimal filtration)
- Press Calculate, then read the result alongside the sources listed below
Use this alongside your own observation, not instead of it. You notice changes in your angelfish that no calculator can pick up.
For related questions, see the other housing tools or browse every angelfish tool.
Before you rely on this
Averages hide a lot of variation. The figure here reflects what is typical for angelfish, but your angelfish may sit well outside it for perfectly ordinary reasons. Use the result to spot changes over time in your own animal rather than to compare it against other people's pets.
Sources and references
The formulas, reference ranges and species data behind the Angelfish Stocking Level Calculator come from these veterinary references, professional bodies and published research.
- RSPCAAdvice and Welfarerspca.org.uk(opens in a new tab)
- Merck Veterinary ManualExotic and Laboratory Animalsmerckvetmanual.com(opens in a new tab)
- pdsa.org.ukPDSA Pet Health Hubpdsa.org.uk(opens in a new tab)
- University of Florida IFAS ExtensionAquacultureedis.ifas.ufl.edu(opens in a new tab)
- Merck Veterinary ManualRoutine Care and Breedingmerckvetmanual.com(opens in a new tab)
- Built on veterinary referencesFormulas and ranges come from veterinary manuals, university research and welfare bodies, listed above for you to check.
- Instant resultsNo page reload, no waiting and no account. Enter your details and the result appears straight away.
- Private by designCalculations run in your browser. Nothing you enter is stored on our servers or shared with anyone.
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