How big do dwarf gouramis get?
9–10 cm (3.5–4 inches) — bigger than the store label suggests, and big enough that a 40-liter tank is a long-term liability.
How long do dwarf gouramis live?
4–6 years with excellent water quality — but they are one of the more disease-prone gouramis, and dwarf gourami iridovirus (see below) makes "average" lifespans much shorter in practice.
Dwarf gourami tank size and water parameters
A pair wants 75+ liters (20+ gallons) with planting and cover. Temperature 24–28 °C, pH 6.0–7.5, soft to moderately hard water. As labyrinth fish they gulp air at the surface — keep the water level an inch or two below the lid and never seal the tank airtight.
Dwarf gourami tank mates
Peaceful community fish: neon tetras, rasboras, corydoras and peaceful barbs. Avoid: other gouramis (males fight to the death), fin-nippers, and anything fast enough to outcompete them at feeding time.
Dwarf gourami disease: what is dwarf gourami iridovirus?
DGIV is a viral disease that affects dwarf gouramis specifically: progressive color loss, lethargy, skin ulcers and wasting, usually fatal. There is no treatment. Prevention is the whole game: buy from reputable breeders rather than mass-market supply, quarantine every new fish for 2–4 weeks, and keep water quality genuinely high — stressed fish get sick, healthy fish often do not.
Do dwarf gouramis need live plants?
They are not obligate plant-breeders like bettas, but they are far calmer and healthier in a planted, gently lit tank with broken sightlines. Tall, flowing plants and a few floating cover plants suit them; a bare, bright tank produces a permanently stressed fish.
Beginner mistakes to avoid
- Two male dwarf gouramis in one tank — they will fight until one is killed.
- A bare, brightly lit tank: chronic stress shortens their life dramatically.
- No quarantine for new fish — DGIV arrives with the new gourami.
- Ignoring early color loss; by the time ulcers appear, the disease is advanced.