First check the temperature (25–28°C): below 22°C, metabolism slows and appetite disappears. Then check water parameters (NH₃ and NO₂ at 0). A 1–2 day fast is normal; beyond 3 days, look for disease symptoms (bloated belly, spots, clamped fins).
It's a bubble nest! This natural male behaviour is an excellent sign: it means the fish is healthy, feels safe and is ready to breed. Don't destroy the nest — he'll rebuild it anyway.
Yes, perfectly. The male Betta splendens is territorial and solitary by nature. It doesn't get lonely, provided its tank is enriched (plants, hiding spots) and at least 40 litres. It's cohabitation that needs careful thought, not solitude.
Most common causes: water too cold (check the heater), nitrite spike, overfeeding (constipation) or simply resting — bettas sleep and nap. If stillness comes with clamped fins or appetite loss, test the water immediately.
On average 2 to 4 years in good conditions. A pet-shop betta is often already 6 months to 1 year old. Clean heated water, a varied diet and a tank of at least 40 litres maximise its lifespan.
Never two males: they will fight to the death. A male-female pair only tolerates each other during breeding. Female sororities exist but remain risky and are reserved for experienced keepers with large, heavily planted tanks.
Find the cause: sharp décor, strong current, nipping tankmates, or fin rot (blackened or whitish edges). A mechanical tear heals on its own within weeks in clean water. Rot requires increased water changes and sometimes treatment.
Yes, absolutely (unless the room is constantly 25°C+). The betta is a tropical fish: below 22°C its immune system collapses. A thermostat heater set to 25–28°C is the most important piece of equipment.