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Betta Fish

Fish

The flowing-finned solo showoff that thrives in its own space and recognizes its keeper!

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🤓 Did you know? Wild betta fish live in shallow rice paddies and slow-moving water that can run low on oxygen, so they evolved a labyrinth organ that lets them gulp air directly from the surface. Males also build floating bubble nests out of saliva-coated air bubbles to hold their eggs - a behavior captive males will still perform even without a female present.

🗓️ The first week

The numbers a new owner needs in the first week, each from the article it links to. Rows with no link come from the encyclopedia.

Tank size: 5 gallons, heated and filtered, is the real minimum. Not the bowls or unheated cups bettas are often sold in.Setup guide →
Heater and filter: A 15 to 25 watt adjustable heater holding a stable 76 to 82°F, 78 to 80°F the sweet spot. A gentle, low-flow filter such as a sponge filter, since a betta's long fins can't handle strong current.Setup guide →
Water parameters: Ammonia and nitrite at 0 ppm with no safe nonzero reading for either, nitrate under 20 ppm, pH 6.5 to 7.5. Weekly water changes of 25 to 30%, always with a dechlorinator.Water guide →
Cycling: Cycle the tank before adding the fish. A fishless cycle typically takes 4 to 6 weeks at a stable warm temperature.Cycling guide →
Feeding schedule: 2 to 4 small, high-protein betta pellets, once or twice a day, no more than would fit in the size of the fish's eye. Fast one day a week.Feeding guide →
Not eating: A healthy adult can physically survive up to about two weeks, but that's an emergency ceiling, not a target. Start investigating around 5 to 7 days of refused food, sooner with a swollen belly, clamped fins, or lethargy.Feeding guide →
Handling: Never bare hands, it strips the protective slime coat on contact. Move the fish with a net or a cup. Float a new bag about 15 minutes before release so temperatures can equalize.Handling guide →
Budget: $5 to $30 for the fish, up to about $55 for rare varieties. $100 to $300 for a full setup. $10 to $25 a month after that.Cost guide →
Adult size: 2.5 to 3 inches.
Lifespan: 2 to 4 years typical, up to 5 years in captivity with excellent care.
Tankmates: One male, alone or with corydoras, mystery snails, ghost shrimp or small tetras. Never tiger barbs, any nipper, or a long-finned fish. A female sorority needs 10 gallons and cover.Aquarium Stocking and Tankmates →
Ich: White spots: raise the tank slowly to 86°F with an air stone, inside this species' range, and hold it two weeks. Or a tablespoon of aquarium salt per 5 gallons. Quarantine 30 days after.Treating Ich →
Quarantine: At least 30 days in a bare hospital tank before joining others. Thirty days is the floor, not the target.Quarantine guide →
Power outage: Oxygen loss is the fast danger, not the cold or the dark. Aerate right away with a battery air pump, or agitate the surface by hand roughly every 10 to 15 minutes in a small tank. A betta's transport bag needs far more air than a typical fish bag, since it breathes air directly through its labyrinth organ.Power outage guide →

🚨 Emergency card

Test the water and temperature first, then act on these the same day.

Raised, pinecone-like scales (dropsy), a poor prognosis but worth same-day contact with an aquatic vet
Pale or greyish saddle-shaped patches, ragged fin edges, or a cottony fuzz (columnaris)
A fine gold or rust-colored dusty sheen (velvet), which moves fast and can kill quickly
Buoyancy problems that do not clear after a 2 to 3 day fast
Any illness that does not improve once water quality and temperature are corrected

An aquatic vet, found before you need one, for the serious or unclear cases. Most of this list is prevented by a heated, filtered, cycled tank.

From Common Betta Fish Health Issues (And Why Water Quality Comes First) →

📰 Where to go next

How Much Does a Betta Fish Really Cost?

$5 to $30 for the fish, a $100 to $300 setup, and $10 to $25 a month after that.

Betta Fish Tank Setup: Bigger, Warmer, and Cycled

The 5-gallon minimum, the heater and sponge filter that actually fit a betta's fins, and cycling before the fish goes in.

Betta Fish Water Parameters: The Numbers That Actually Matter

The target ranges for temperature, pH, ammonia, nitrite, and nitrate, and the testing schedule that actually catches trouble early.

Betta Fish Feeding: Schedule, Diet, and Why They Stop Eating

Portion size relative to the fish's own eye, safe treats and foods to avoid, and the honest range of reasons a betta stops eating.

How to Handle a Betta Fish (Hint: You Mostly Don't)

Why bare hands strip the slime coat, safe net and cup transfers, and how to read stress signs from a distance instead.

Common Betta Fish Health Issues (And Why Water Quality Comes First)

Fin rot, ich, velvet, columnaris, swim bladder disorder, dropsy, and why water quality is almost always the first fix.

Betta Enrichment: Three Studies, and a Mirror Is Not a Toy

What three published studies say about space and planting, and why a mirror is a stress test, not a toy.

🛒 What to buy

5+ gallon tank with a tight-fitting lid (bettas jump)

Aquarium heater sized for the tank

Gentle sponge filter

Soft substrate (sand or smooth gravel)

Live or silk plants (no sharp plastic)

Water conditioner/dechlorinator

Liquid-reagent water test kit

Net and a transfer cup

Betta-specific pellets

Freeze-dried or frozen bloodworms/brine shrimp for variety

Prices and the reasoning behind each item are in How Much Does a Betta Fish Really Cost?.

❓ Frequently Asked Questions

What size tank does a betta fish need?

Five gallons is the current standard minimum, a genuine improvement over older bowl-based advice. Bettas can technically survive in smaller volumes, but bigger tanks are easier to keep stable since temperature and water chemistry swing less in more water. Always use a lid, bettas are surprisingly good jumpers.

Why won't my betta eat?

Most commonly it's stress from a recent move or tank change, pickiness about a new food, or water that's too cold or of poor quality. Bettas need water in the roughly 76 to 82°F range, cooler water slows their metabolism and appetite noticeably. Check water quality and temperature before assuming anything more serious.

What should I do before reaching for medication?

Test and correct water quality and temperature first. A heated, filtered tank on a consistent water-change schedule is what makes a huge share of betta illness resolve or never start. Most cases never need an aquatic vet, though one is worth finding for a serious or unclear illness.

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