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Species profile

Flag Cichlid

Mesonauta festivus

Common names: Flag Cichlid, Festive Cichlid

Recognized speciesCichlids
Flag Cichlid (Mesonauta festivus)

Adult size

Up to 18 cm

Typical adult length 12–18 cm.

Up to 18 cm

Countries of origin

  • See all stock from Bolivia
  • See all stock from Brazil
  • See all stock from Paraguay
  • See all stock from Peru

Good fit for your tank?

Good fit for

  • Mature planted aquarium setups
  • Intermediate shrimp keepers

Think carefully if

  • The aquarium contains shrimp-eating fish
  • The tank is newly cycled
  • Water conditions change frequently

A tall, social Amazonian cichlid that swims among vegetation and branches and is best maintained in a calm group.

Appearance and Identification

A laterally compressed silver to olive cichlid with a bold diagonal stripe from the mouth toward the dorsal fin and subtle vertical bars.

Several Mesonauta species are sold as festivus. The diagonal stripe, bar pattern, scale counts, and locality should be checked.

Sexes are similar. Mature males may be larger with longer fin tips, while females become fuller before spawning.

Tank Requirements

Suggested filter
About 600–900 litres an hour
Suggested heater
About 300–450 W for this tank
Minimum tank volume
300 litres
Minimum tank length
150 cm
Minimum group size
5
Recommended group size
6
Activity level
Moderate
Flow preference
Low
Planting preference
Moderately planted
Hiding places
Yes
Lid recommended
Yes
Jumping risk
Low

Keep a group in a tall planted aquarium with open swimming space, vertical branches, floating cover, broad leaves, and gentle filtration.

Behaviour and Tankmates

Generally peaceful and social, but breeding pairs defend vertical spawning sites.

Best in a group of five or more. Pairs form within the group and should have space to separate.

Pair aggression is focused around eggs and larvae rather than the entire tank in a spacious setup.

Suitable with peaceful medium-sized Amazonian fish. Very small fish and shrimp may be eaten, and fin-nippers should be avoided.

Check tankmates for this species

Water Parameters

Temperature
24–29 °C
pH
5–7.5
GH
1–12
KH
0–6
TDS
30–220
Stability importance
Important

Warm soft to moderately mineralised water is suitable. Stable water and calm surroundings reduce skittish behaviour.

Parameter caveat
The fish can jump when frightened. Use a secure lid and avoid aggressive tank mates.

Feeding

Diet types
Herbivore, Insectivore, Omnivore
Feeding frequency
Daily
Preferred foods
  • Quality sinking cichlid pelletUse a staple pellet appropriate to the fish size and mouth shape.
  • Chopped shrimp, mussel, or earthwormOffer clean unseasoned portions as rotating protein foods.
  • Blanched leafy greens or peasUseful for omnivorous and plant-eating species; remove leftovers promptly.
  • Frozen krill or mysisFeed in moderation to add variety and support colour.

An omnivore taking insects, crustaceans, fruits, seeds, plant material, and prepared foods.

Include plant material and floating or slowly sinking foods. Avoid a protein-only diet.

Breeding

Breeding type
Egg Layer, Substrate Spawner
Breeding difficulty
Moderate
Breeding temperature
27 °C
Breeding pH
6.5
Brood or egg count
Several hundred eggs.
Incubation
3 days
Parental care
Biparental care
Baby foods
  • Newly hatched brine shrimpSuitable after yolk absorption for most cichlid fry.
  • Crushed high-quality cichlid pelletIntroduce gradually as fry grow.
  • Finely chopped frozen cyclopsUseful supplementary food for larger fry.

A biparental substrate spawner that commonly places eggs on a vertical leaf, branch, or other upright surface.

Habitat and Origin

Geographic origin
Amazon Basin, Bolivia, Brazil, Paraguay, Peru, South America
Natural habitat
Floodplain, Slow River, Vegetated Shoreline
Aquarium contexts
Freshwater Aquarium, Freshwater Community, Large Freshwater Aquarium, Planted Aquarium
Audience level
Intermediate

Classification

Profile type
Recognized species
Genus
Mesonauta
Family
Cichlidae
Species group
Cichlids, Fish, South American Cichlids

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