Green chromide

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.

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.