Betta Smaragdina

Betta smaragdina

Animalia›Chordata›Actinopterygii›Osphronemidae

📍 Thailand, Laos

The Emerald Betta is a wild Betta splendens-group species from northeast Thailand and Laos, known for spectacular iridescent emerald-green scale edging that creates a metallic mesh pattern across a dark base. Males are large and aggressive, similar in temperament to B. splendens. A hardy species once established, it thrives in slow-moving, heavily planted tanks with blackwater-type water chemistry.

Size3"

Min Tank10g

semi-aggressive

Zonemid

Care Guide

Diet

Emerald Bettas are strict carnivores and require high-protein foods including quality betta pellets, bloodworms, daphnia, and mosquito larvae. Feed small portions once daily, offering only what they can consume in 2-3 minutes. Occasional live food (mosquito larvae, small insects) promotes natural hunting behavior and vibrant coloration.

Behavior

Males are highly territorial and aggressive toward other males, requiring solitary housing or species-only tanks. They are active mid-water swimmers with deliberate, graceful movements and will display elaborate fin flaring when threatened or establishing dominance. Females may tolerate brief cohabitation during spawning but should otherwise be kept separately.

Breeding

Breeding Emerald Bettas in captivity is difficult and rarely attempted by hobbyists. Males construct bubble nests and will aggressively guard fry, but conditioning pairs requires careful management and large tanks with dense vegetation. Success rates are low compared to domesticated Betta splendens, and fry rearing demands specialized live foods and pristine water conditions.

Tank Mates

Otocinclus

Small, peaceful algae-eaters that occupy bottom zone and avoid betta aggression

good

Anubias Barteri

Hardy plant that provides shelter and blackwater aesthetic without being uprooted

excellent

Java Moss

Dense vegetation creates refuge areas and mimics natural habitat structure

excellent

Ramshorn Snail

Slow-moving snails that rarely trigger aggression and help maintain water quality

good

Cryptocoryne Wendtii

Low-growing plant ideal for blackwater setups that bettas won't destroy

excellent

Common Diseases

Fin Rot

Symptoms

Frayed, discolored, or deteriorating fin edges; lethargy; loss of appetite

Treatment

Perform 25-50% water changes every 2-3 days, maintain pristine water quality (0 ammonia, <10 ppm nitrate), and consider antibacterial medication if severe

Ich (Ichthyophthirius multifiliis)

Symptoms

White spots on body and fins, rapid breathing, flashing against surfaces, lethargy

Treatment

Raise temperature gradually to 28-30°C, increase aeration, perform daily water changes, and use ich-specific medication if symptoms persist beyond 3 days

Velvet Disease

Symptoms

Fine golden or rust-colored dust on body, clamped fins, rapid gill movement, lethargy

Treatment

Darken tank, raise temperature to 28-30°C, improve aeration, perform daily 25% water changes, and treat with copper-free medication designed for bettas

Popeye (Exophthalmia)

Symptoms

One or both eyes swollen and protruding, cloudiness, loss of appetite

Treatment

Perform immediate 50% water change to improve water quality, maintain optimal parameters (pH 6.0-7.5, 0 ammonia), and monitor closely; antibacterial treatment if caused by infection