Betta Fish Care Guide
Everything you need to know about keeping bettas healthy and thriving. From tank setup to disease prevention, based on science, not myths.
Tank Size Requirements
Myth: Bettas thrive in small bowls
This is one of the most harmful myths in fishkeeping. In the wild, bettas live in rice paddies that can span acres, not puddles. Small containers lead to ammonia buildup, temperature swings, and shortened lifespans.
Minimum Requirements
- Minimum: 5 gallons (19 liters), the absolute floor
- Recommended: 10+ gallons for a single betta
- With tank mates: 20+ gallons to reduce aggression
- Heater: Required (bettas are tropical)
- Filter: Gentle flow since bettas have long fins
- Lid: Essential because bettas jump
A properly sized tank with stable parameters can extend a betta's lifespan from 1-2 years (in a bowl) to 4-5 years or more.
Ideal Water Parameters
Testing Schedule
Test ammonia, nitrite, and nitrate weekly in an established tank, or daily during cycling or after adding new fish. Temperature should be checked daily. Invest in a reliable thermometer. Sudden parameter swings are more dangerous than slightly imperfect readings.
Diet & Feeding
Bettas are carnivores with upturned mouths designed for surface feeding. They need protein-rich foods, not tropical flakes designed for omnivores.
Recommended Foods
- Staple: High-quality betta pellets (look for whole fish as first ingredient)
- Treats: Frozen or live bloodworms, brine shrimp, daphnia (2-3x per week)
- Avoid: Tropical flakes, freeze-dried foods (cause bloating)
Feeding Schedule
- Amount: 2-3 pellets, twice daily (their stomach is the size of their eye)
- Fasting: Skip feeding one day per week to prevent constipation
- Overfeeding signs: Bloated belly, uneaten food, cloudy water
Tank Mate Compatibility
Individual bettas vary in temperament. Always have a backup plan and monitor closely when introducing tank mates.
Common Diseases & Treatment
Fin Rot
Ragged, discolored fins that appear to be melting away
Poor water quality, bacterial infection
Clean water, aquarium salt, antibacterial medication if severe
Ich (White Spot)
Small white spots on body. Scratching against objects.
Rx: Raise temp to 82°F + ich medication
Velvet
Gold or rust-colored dust on body. Lethargy, clamped fins. Parasitic infection (Oodinium).
Rx: Darken tank, raise temp, copper-based medication
Swim Bladder Disease
Floating sideways, sinking, difficulty swimming. Usually from overfeeding.
Prevention is the best medicine
Most betta diseases are caused by poor water quality. Regular water testing and maintenance prevents 90% of health issues.
Related Resources
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