4-Bar Datnoid (Datnioides microlepis) Care Guide

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Overview

The 4-bar datnoid (Datnioides microlepis) is a striking and popular freshwater fish native to the rivers and lakes of Southeast Asia. This species is known for its distinctive four vertical bars that run across its body, giving it a unique and eye-catching appearance. The 4-bar datnoid is a carnivorous fish that can grow up to 30 cm in length and is often kept in large aquariums or ponds due to its size and active nature.

Natural Habitat

In the wild, the 4-bar datnoid is found in slow-moving rivers, floodplains, and brackish waters throughout Southeast Asia. These fish prefer warm, well-oxygenated waters with plenty of hiding spots and vegetation to provide cover and security.

Tank Requirements

Minimum tank size: 200 liters for juveniles; 300-500 liters for adults
Substrate: Fine sand or smooth gravel
Décor: Driftwood, rocks, and dense planting or PVC caves
Cover: A secure lid is essential, as 4-bar datnoids are known to be escape artists
Air access: The water surface must be accessible for breathing
Lighting: Low to moderate; 4-bar datnoids are primarily crepuscular and nocturnal

Water Parameters

Temperature: 24-30°C
pH: 6.5-8.0
Hardness: 5-25 dGH
Ammonia/Nitrite: 0 ppm
Nitrate: Below 40 ppm

Feeding

The 4-bar datnoid is a carnivorous fish that feeds primarily on live or frozen foods. Ideal diets include:
– Earthworms
– Hikari Massivore sinking pellets
– Raw prawns and mussels
– Bloodworm (live or frozen)
– Whole lance fish and silversides for adults

Feed in the evening after lights-out for best results, as 4-bar datnoids are nocturnal and feed most confidently in darkness.

Tank Mates

The 4-bar datnoid is generally peaceful toward fish that are too large to be considered prey. Good tank mates include:
– Large cichlids that won’t harass them (Uaru, Geophagus, large Eartheater cichlids)
– Arowana and other large surface-oriented fish
– Large, peaceful catfish
– Multiple 4-bar datnoids of similar size

Avoid housing them with:

– Aggressive cichlids that will nip their fins
– Small fish that will be eaten
– Fast-moving competitive feeders

Common Health Issues

– Fin rot: Usually bacterial, triggered by poor water quality or injuries from tank mates. Treat with clean water and antibiotics if severe.
– Skin infections: Reddening or ulceration of the skin. Address water quality immediately.
– Starvation in community tanks: Ensure 4-bar datnoids are actually getting food — observe feeding closely, especially if housed with fast-moving fish.

Where to Buy

4-bar datnoids can be found at various aquarium retailers and online fish suppliers. It’s important to purchase from reputable sources to ensure the health and quality of the fish.