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Ornamental Aquatics / Species Record
Aquatic Animals · SPECIES PROFILE

Discus Fish

Symphysodon aequifasciatus

High-temperature schooling fish; stable water quality, sufficient water volume, and continuous water changes are core requirements.

Discus Fish (Symphysodon aequifasciatus)
Images · CC BY-SA 4.0Rjcastillo / Wikimedia Commons
High-Demand CareRequires More Preparation Update 2026-09-07
Editorial example · Pending Expert Review
Adult Length5.91–7.87 in
Reference Lifespan8–12 yr
Water Temperature Reference80.6–86 °F
Air HumidityN/A
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Ownership Score

Ownership Score

This is an edited estimate of lifestyle compatibility, not an animal value rating. A higher score indicates that, based on current data, the animal is easier to integrate into your daily routine.

37/100 · Requires careful assessment
Beginner suitability28
Handling2
Interactive32
Space42
Cost36
Maintenance28
Travel20
Veterinary Accessibility30
Safety92
RISK SIGNALS
Feeding difficulty 58Environmental control 84Escape risk 8Bite risk 0Toxicity risk 0Noise 92Odor 78Cleaning burden 66
LIFE FIT
Children and families 88Apartments 92Bedrooms 92Frequent travel 5

The composite score is calculated by weighting nine factors: beginner-friendliness, handling ease, interaction, space requirements, cost, maintenance, travel, veterinary access, and safety. Read risk signals according to field direction: lower scores for biting, escape, and toxicity indicate greater safety; higher scores for noise, odor, and cleaning indicate less hassle. Combine this page's environmental requirements and risk notes with your judgment; do not rely solely on the total score.

BEFORE YOU COMMIT

First check whether it fits your life

This brief brings together the space, maintenance, feeding, lifespan and veterinary conditions recorded on this page so you know what to verify next.

37/100 · Requires careful assessment

A better fit if

  • The living conditions need closer planning
  • Adult space is a threshold to solve before purchase
  • Daily maintenance requires a steady time commitment

Resolve these first

  • High-temperature energy consumption:Long-term high water temperature results in continuous electricity costs and cooling management; a power outage plan cannot be omitted.
  • Environmental control needs stricter management
  • Confirm an exotic veterinarian and emergency route before purchase
Adult size
5.91–7.87 in
Reference Lifespan
8 to 12 years
Minimum space
Adults in a small group require at least approximately 66.04 US gal of water volume, with a mature filter and space left for horizontal swimming.
Veterinary Accessibility
Difficult

This is a comparison aid based on the current record, not a purchase, medical or local-law conclusion. Check the sources and local conditions before continuing.

THINGS OWNERS UNDERESTIMATE

Common Underestimations by Keepers

  • High-temperature energy consumptionLong-term high water temperature results in continuous electricity costs and cooling management; a power outage plan cannot be omitted.
  • Group SizeSmall groups are more stable than single specimens, but larger groups increase the workload for water volume, filtration, and water changes.
  • Water Quality FluctuationsShort-term fluctuations in ammonia, nitrite, and temperature can all cause rapid injury.
VETERINARY ACCESS

Veterinary Accessibility

Difficult

Fewer specialists for fish and aquatic amphibians; water quality testing is the first line of defense.

Difficult; transport and water temperature control can affect diagnosis.

Specialist Exotic Pet Care Typically Required
DATA STATUS

Where this record stands

Editorial example
Last updated
2026-09-07
Fields checked
No field review record yet
Reference sources
1 · Reference sources
Professional review
Pending veterinary or taxonomic review
Local rules
Local rules need verification

Source links are starting points for reading. A group-level guide does not verify every value for each species. Check local rules separately.

Basic Information

Native Distribution
Slow-moving waters of the Amazon basin
Body Size and Diameter
Common adult carapace length; see species-specific data for exact carapace width.
Dietary Habits
Omnivore
Activity Cycle
Varies by species; first stabilize day/night lighting and water conditions
Availability of Captive-Bred Individuals
Common
Temperament and Aggression
Suitable for observation. Group hierarchy and stress affect feeding; appearance alone is insufficient.
Toxicity and Contact Risks
Non-venomous. Avoid fin and body surface injury when transferring with a net. Contact Risks: Low。
Socialization and Handling
Stable small groups are more suitable, but the more individuals, the heavier the burden on water volume, filtration, and water changes.

Environmental Parameters

Water Temperature

Water temperature approximately 80.6–86 °F; stable water temperature and dissolved oxygen are more important than localized hot spots.

Humidity and Ventilation

Fully aquatic; air humidity not applicable.

Lighting and Circadian Rhythm

Maintain regular day-night lighting and provide cover; avoid strong light and sudden changes.

Basking Spot / Localized Heat

Not applicable; core requirements are stable water temperature, dissolved oxygen, cover, and a mature cycle.

UVB Requirements

Maintain regular day-night lighting and provide cover; avoid strong light and sudden changes.

Adult Space

Minimum: Adults in a small group require at least approximately 66.04 US gal of water volume, with a mature filter and space left for horizontal swimming.
Recommended: Recommended adult group size is 92.46 US gal or larger water volume, with continuous water changes and controlled flow rate.

Substrate and Water

Substrate free of pollutants and with appropriate particle size; perform regular waste removal. · Continuously test ammonia, nitrite, nitrate, and temperature after the mature cycle; keep parameters stable during water changes.

Water Quality · pH 6–7

Continuously test ammonia, nitrite, nitrate, and temperature after the mature cycle; keep parameters stable during water changes.

These ranges are for planning the environment of a healthy adult, not a constant value for the entire enclosure, and do not cover disease, breeding, or juvenile stages.

Diet and Nutrition

Feed in small amounts multiple times daily, rotating high-quality pellets and frozen foods, and remove uneaten food promptly.

Feeding Frequency
Feed in small amounts multiple times daily, adjusting according to group feeding and water quality.
Live Prey Requirement
Optional
Rodent Pellets
Not Required

Enclosure and activity space

Adults in a small group require at least approximately 66.04 US gal of water volume, with a mature filter and space left for horizontal swimming.

Dimensions are editor suggestions, not mandatory minimum standards in all regions. Group size, individual body size, and layout may require more space.

Frequently Asked Questions

Suitable for first-time fish keepers?

Not very suitable. High temperature, schooling, water quality, and water change requirements all demand stable experience and time.

Suitable for a small aquarium?

Not recommended. Adults and groups require greater horizontal space, a mature filter, and stable water volume.

Risks and Legality

  • High water temperature results in continuous electricity costs and cooling management; a power outage plan cannot be omitted.
  • Short-term fluctuations in ammonia, nitrite, and temperature can all cause rapid injury.

Sources and editor notes

This page is a structured editing example and has not yet undergone field-by-field expert review. Reference links are for further consultation; data for some groups may not apply to every species. Please read the full manual before formal husbandry.

OATA Ornamental Aquatic Care guidelines

Extended reading for the group; parameters still require verification field by field.

View data scope and update methods ↗
SIMILAR SPECIES

Other options within the same group

Similar species does not mean they can be co-housed