Best for
Aquariums where its role fits: centerpiece.
D
Fish · Freshwater
Discus
Symphysodon aequifasciatus
The discus is an advanced species because it needs stable high temperature, very clean water and careful group management. It is not inherently fragile, but it punishes maintenance mistakes quickly.
It does best in mature, spacious and calm aquariums with tankmates that tolerate long-term warmth. The goal is not mere survival, but good feeding, confidence, color and shape.
Difficulty
Advanced
Aggression
3/10
Schooling
Yes
Size
18.00 cm
Minimum volume
250 L
Temperature
28.0-31.0 ºC
Zone
Midwater
Lifespan
10 years
Quick profile scan
fish
Territoriality
Medium
Aggression
3/10
Activity
Moderate
Thermal sensitivity
High
Bioload
High
Speed
Moderate
Predation risk
Opportunistic
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Check whether this species fits your aquarium
Analyze volume, parameters, behavior and relationships with other species.
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Quick verdict
A practical summary to quickly decide whether it fits your aquarium.
Avoid
Mixes marked as high risk or not recommended in manual relationships.
Compatible with
Has positive or conditional references with species such as Cardinal tetra.
Typical risk
Bioload and adult volume should be planned with margin.
Aquarium zone
Where it lives best
Surface
Midwater
primary
Bottom
Quick compatibility
Community signals
Shrimp
Conditional
Snails
Compatible
Slow fish
Compatible
Aggressive fish
Conditional
Small fish
Conditional
Large fish
Conditional
Delicate plants
Conditional
Buying decision
Before buying Discus
Review these points before adding it to your aquarium. They are practical notes based on its profile, ecological data, and known relationships.
L
Adult volume
Make sure your aquarium is above 250 L before buying it.
G
Minimum group
Do not keep it alone if it needs a group; plan space for the right number of individuals.
B
Bioload
Plan filtration, water changes, and total stocking: this species can heavily load the system.
C
Stable temperature
Avoid keeping it at the edges of its temperature range for long periods.
Parameters
Water conditions
pH
5.0 - 6.8
GH
1 - 8
KH
0 - 4
Temperature
28.0 - 31.0 ºC
Growth and behavior
Juvenile to adult
Juvenile
As a juvenile it feels safer in a group and usually uses the midwater area with coordinated movement. An insufficient group can increase stress and erratic behavior.
Shift
The most important adult change is increased spatial and biological pressure, so the aquarium should be planned for the long term.
Adult
As an adult it keeps a strong social pattern and is more stable in adequate groups. In balanced communities it usually occupies the midwater area without causing major conflict.
Ecological profile
Role and biological pressure
Centerpiece
Centerpiece
Large
High
Narrow
Opportunistic
Profile: centerpiece species, with high bioload and primary use of the midwater area. It should be kept in a group to show stable behavior and reduce stress. It may show opportunistic predation toward fry or very small animals. Temperature stability matters; avoid long-term maintenance at the edges of its range.
Ecological radar
profile
Territoriality
52%
Aggression
30%
Activity
52%
Thermal sensitivity
78%
Bioload
78%
Common mistakes
What to avoid
Keeping it in tanks below the recommended adult volume.
Keeping too few individuals for a social species.
Keeping temperature at the edges of the range for long periods.
Relations
Compatible with
✓
C
Cardinal tetra
Compatible
Main risk: Water parameters
Low risk
Symphysodon aequifasciatus + Paracheirodon axelrodi: cohabitation is usually viable if volume, parameters, groups and adult behavior are respected.
S
Sterbai cory
Compatible
Main risk: Water parameters
Low risk
Symphysodon aequifasciatus + Corydoras sterbai: cohabitation is usually viable if volume, parameters, groups and adult behavior are respected.
Angelfish
Conditional
Main risk: Water parameters
Review conditions
Symphysodon aequifasciatus + Pterophyllum scalare: territoriality, dominance or competition for calm areas of the aquarium may occur.
B
Bronze cory
Conditional
Main risk: Thermal stress
Review conditions
Symphysodon aequifasciatus + Corydoras aeneus: water parameters are not fully compatible or only overlap within a limited range.
G
German blue ram
Conditional
Main risk: Water parameters
Review conditions
Symphysodon aequifasciatus + Mikrogeophagus ramirezi: territoriality, dominance or competition for calm areas of the aquarium may occur.
Relations
Avoid keeping with
!
Oscar
Not recommended
Main risk: Water parameters
Not recommended
Astronotus ocellatus + Symphysodon aequifasciatus: territoriality, dominance or competition for calm areas of the aquarium may occur.
G
Goldfish
Not recommended
Main risk: Thermal stress
Not recommended
Carassius auratus + Symphysodon aequifasciatus: this combines coldwater or temperate species with tropical species that need different temperatures.
P
Peppered cory
High risk
Main risk: Thermal stress
High risk
Symphysodon aequifasciatus + Corydoras paleatus: water parameters are not fully compatible or only overlap within a limited range.
T
Tiger barb
High risk
Main risk: Fin nipping
High risk
Symphysodon aequifasciatus + Puntigrus tetrazona: there is a risk of fin nipping, harassment or stress in slow, nervous or long-finned species.
Essential care
Keep high temperature, mature filtration and consistent water changes. Avoid cool-water, nervous or aggressive tankmates. Adult cardinal tetras and Corydoras sterbai often fit better than species that suffer long-term heat.
Daily time
20 min
Related biomes
Breeding
Pair breeding is possible, but requires stability, clean water and low pressure from other fish. Parents guard eggs and fry feed from body mucus, making the process experience-demanding.
Oviparous
Difficult
Machos algo más esbeltos; hembras más robustas
Alerts and health
- Agua muy estable
- Temperatura alta
- Mantenimiento estricto
Common issues
Hexamita
Ich
Parásitos
Expert notes
Interesting details
01
Es una especie muy popular en acuariofilia
02
Se aprecia más cuando se mantiene correctamente
Editorial confidence
Last review: June 2026
Content based on parameters, ecological profiles and manual relationships.
Profile data
Ecological profile
Manual relationships
General aquarium observation
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