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Green chromide

Etroplus suratensis

The green chromide is a large, disc-shaped schooling cichlid from Asian estuaries. It requires a 400L brackish tank, a heavily herbivorous diet, and forms monogamous pairs that fiercely defend their fry.

Taxonomy
Class:Actinopteri
Order:Perciformes
Family:Cichlidae
Genus:Etroplus
Species:Etroplus suratensis

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Water Temperature

22 - 30 °C

pH Value

7.5 - 8.5

Water type

Freshwater / Brackish / Marine

Tank level

Bottom and middle

Adult size

30 cm

Minimum tank volume

>= 300 L

Minimum group

>= 5

GH

15 - 30 dGH

KH

7 - 15 dKH

TDS

295 - 600 ppm

Conductivity

461 - 938 uS/cm

Species description

Geographical Origin and Habitat: Etroplus suratensis is native to southern India (especially Kerala) and Sri Lanka. It primarily inhabits brackish estuaries, coastal lagoons, tidal creeks, and mangrove swamps, though it occasionally enters coastal marine waters or inland freshwaters.
Taxonomy and Morphology: It belongs to the family Cichlidae. Features a highly laterally compressed, oval, and almost disc-like body shape. It can grow to a significant size, reaching up to 25-30 cm in the wild, though they typically remain slightly smaller in aquaria.
Social Behavior: A schooling species in its juvenile stages. Adults are relatively peaceful but establish territorial boundaries, especially when breeding. They form stable, monogamous pairs that defend their spawning site and fry with extreme dedication.
Coloration and Sexual Dimorphism: The base color is dark olive-green to greyish-green with 6-8 dark vertical bands along the flanks, covered in a dense pattern of small, brilliant pearly-white or green spots. Sexual dimorphism is virtually non-existent, making sexing difficult.

Care, breeding and tankmates

Aquarium Setup: Requires a large tank of at least 350-400 liters to house a small group. Use a sandy substrate with large rocks and driftwood to define territories. Live plants are usually eaten or uprooted, so tough species like Microsorum or artificial plants are recommended.
Diet and Feeding: An omnivore with a strong herbivorous preference. In captivity, their diet should consist of spirulina flakes, blanched spinach, zucchini, and seaweed, supplemented with meaty foods like artemia, mysis, and high-quality cichlid pellets.
Water Quality: Thrives best in brackish water conditions (salinity 1.005-1.012). Stable water chemistry is key: pH 7.5 to 8.5, high hardness (dGH 15-30), and temperatures between 24°C and 28°C. Robust filtration and regular water changes are required to keep nitrates low.
Compatibility and Cohabitation: Can be kept with other medium to large brackish water fish like Scats (Scatophagus argus), Archerfish (Toxotes), or orange chromides (Etroplus maculatus). Avoid housing them with small fish that could easily be eaten or bullied.
Aquarium Breeding: Spawns on flat surfaces like rocks or slate. Both parents participate in cleaning the site and guarding the eggs and fry. They defend their offspring aggressively. Fry can be fed newly hatched brine shrimp once they are free-swimming.
Risks and Diseases: Highly prone to bacterial and fungal infections if kept in pure freshwater long-term, as brackish conditions are vital for their immune health. Stress from cramped spaces can cause systemic illness; high dissolved oxygen levels are required.

Geographic Origin and Distribution

Etroplus suratensis is native to southern India (especially Kerala) and Sri Lanka. It primarily inhabits brackish estuaries, coastal lagoons, tidal creeks, and mangrove swamps, though it occasionally enters coastal marine waters or inland freshwaters.

Origin

South and Southeast Asia

Fish profile

Temperament
Semi-aggressive
The overall temperament of Etroplus suratensis can be described as peaceful to semi-aggressive. Understanding their personality is vital for maintaining a peaceful and stress-free environment. They may exhibit unique behaviors when interacting with their surroundings or during feeding time. Careful consideration of their disposition leads to a more rewarding fishkeeping experience.
Diet
Herbivore
The natural diet of Etroplus suratensis is primarily herbivorous. In captivity, they should be offered a varied selection of high-quality foods to meet their nutritional needs. Incorporating both dry commercial diets and frozen or live options will ensure optimal health and coloration. A varied diet prevents nutritional deficiencies.
Sex ratio
Pair
The ideal sex ratio for keeping Etroplus suratensis is typically pairs. Keeping them in these numbers helps reduce intraspecific aggression and mimics their natural social structure. Providing ample hiding spots can further alleviate tension among dominant individuals. Always monitor the group dynamics when introducing new specimens.
Feeding frequency
TWO_THREE_DAILY
Feeding Etroplus suratensis should generally be done frequent. It is important to provide only what they can consume in a few minutes to prevent leftover food from decaying. Establishing a regular feeding schedule helps keep the fish active and healthy. Adjust the frequency if you observe signs of undernourishment or overfeeding.
Bioload
The bioload produced by Etroplus suratensis is generally considered high. This means that the filtration system must be adequately sized to handle their waste output. Regular water changes and tank maintenance are strongly recommended to keep the environment healthy. Failure to do so can result in poor water quality and stress the fish.
Flow
Strong
In their natural habitat, Etroplus suratensis experiences water flow that is moderate. Replicating this in the aquarium is crucial for their well-being and natural behavior. Appropriate water movement aids in oxygenation and prevents dead spots in the tank. Utilizing adjustable powerheads can help achieve the perfect balance.
Jump risk
No
Reproduction
Oviparous
Regarding reproduction, Etroplus suratensis is known to be a egg-layer. Breeding them in a home aquarium requires specific water parameters and a dedicated setup. Providing the correct spawning media and conditioning the adults with high-quality foods will increase success. Raising the fry can be challenging and requires specialized microscopic foods initially.
Compatibility & tankmates
Verify
When it comes to compatibility, Etroplus suratensis is characterized as semi-aggressive. They should be housed with tank mates that share similar water requirements and temperament. Care must be taken not to include species that could easily become prey or outcompete them for food. Observation is key to ensuring a harmonious community.
Tank level
Middle/Bottom
In the aquarium, Etroplus suratensis prefers to occupy the mid-bottom level. Designing the aquascape to cater to this preference ensures the fish feel secure and display their best colors. Ensure that there is adequate swimming space and appropriate decor in their preferred zone. This vertical distribution also allows for careful selection of tank mates that occupy other levels.

Window to the official scientific data of the species

Data synced on: 06/15/2026

Scientific Parameters & Models

Trophic level
2.9 ± 0.26 se
Resilience
Medium (1.4 - 4.4 years)
Phylogenetic uniqueness (PD50)
0.75
Bayesian Length-Weight
a = 0.01585, b = 2.93
VulnerabilityLow to moderate vulnerability (30 / 100)

Image gallery

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Last updated: 06/30/2026
Green chromide (Etroplus suratensis) Care Guide & Tank Setup | Atlarium