← Open Betta GillfriendFrançais

Myths and Facts

Betta Gillfriend care rules: one betta per tank. Mirror or flare practice: one 2-minute session a day, with at least 2 rest days a week. Train: up to 10 minutes a week.

Bettas are probably the most myth-covered fish in the pet store. Let's bust a few, fin-ally. Each myth below gets a verdict and the evidence behind it. Where the science is thin, we say so.

Tip: A good rule for any betta "hack" you see online: if it promises a quick fix without testing your water first, be suspicious.

Myth 1: "Bettas live in puddles, so a bowl or vase is fine"

Verdict: Busted.

What to do instead: at least 19 L (5 US gal) with a heater, a gentle filter, a lid and plants. See Tank size.

Myth 2: "Bettas don't need a heater"

Verdict: Busted (especially in Canada).

Bettas are tropical. Wild habitats measured by UF IFAS ranged from about 27–31.5 °C. In captivity, aim for a steady 24–27 °C (76–81 °F). Most Canadian homes sit around 18–22 °C, and colder in winter near windows, so an unheated betta lives in permanent chill. Cold bettas get sluggish, stop eating and get sick more easily. Use an adjustable heater plus a separate thermometer.

Myth 3: "Bettas don't need a filter"

Verdict: Mostly busted.

A filter is home to the beneficial bacteria that turn toxic ammonia and nitrite into nitrate (the nitrogen cycle). Bettas dislike strong current, but that means choosing a gentle filter (a sponge filter or a baffled hang-on-back), not skipping one. Small unfiltered tanks are possible only with frequent, careful water changes, and they're much harder to keep stable. See Gear and test kits.

Myth 4: "Bettas only live a year"

Verdict: Busted.

Many store bettas are already 6–12 months old when sold, and many die early from cold, small, uncycled tanks. With good care, a typical betta lives about 3–5 years (PetMD, vet-reviewed), and some go longer. A research colony reports around 2 years under lab conditions. See Senior bettas.

Myth 5: "Two males can share a big tank"

Verdict: Busted.

Male bettas fight, and the "Life in a fishbowl" researchers found that even large tanks did not let two males live together safely. Females can be aggressive too; see Sororities.

Myth 6: "Bettas are happy in a cup at the store"

Verdict: Busted, though it's short-term.

The cups are for shipping and display. The 2025 "Life beyond a jar" authors recommended a minimum of about 5.6 L for retail housing, and much more at home. Buying a betta isn't the problem; leaving him in the cup is.

Myth 7: "Feed peas for constipation"

Verdict: Outdated.

Bettas are carnivores (insectivores) with a short gut. Peas aren't a natural food and there's little evidence they help. For mild bloat or constipation, the usual first step is fasting for 1–3 days, then smaller meals and a varied diet. If bloat comes with raised scales or doesn't improve, see a vet. See Diet and feeding.

Myth 8: "Aquarium salt cures everything"

Verdict: Busted (it's a tool, not a tonic).

Warning: Never use table salt with iodine or anti-caking agents, road salt, or water-softener salt. Measure salt by weight (grams per litre), not "pinches".

Myth 9: "Epsom salt fixes dropsy, bloat and popeye"

Verdict: Unproven.

Epsom salt is magnesium sulfate, not the same as aquarium salt. It's widely recommended in hobby forums for swelling, constipation and popeye, but we found no controlled studies in bettas. Dropsy in particular is usually a sign of serious internal disease (often organ failure), and Epsom salt can't fix the cause. If you try it, it should be as supportive care alongside proper diagnosis, ideally with an aquatic vet's guidance, and never in the main tank with plants and invertebrates. See Common illnesses.

Myth 10: "A bubble nest means a happy betta"

Verdict: Half-true.

A bubble nest is a breeding behaviour of male bettas. Healthy males often build them, but plenty of healthy, content bettas never do, and some stressed ones still build. Treat it as a nice sign, not a health test. See Behaviour.

Myth 11: "Flaring all day is good exercise"

Verdict: Busted in excess.

Short flare sessions (one 2-minute session a day) can be enrichment. Constant flaring, such as at a reflection, a neighbour betta or a mirror left in the tank, is stress. Keep mirror time to one 2-minute session a day, with at least 2 rest days a week, and cover reflective glass if your betta flares at himself non-stop. See Enrichment.

Myth 12: "Bettas are boring, they just float"

Verdict: Busted.

Bettas recognise their keepers, learn routines and can be trained to follow a finger or swim through a hoop. They do rest a lot and sleep at night (often lying on a leaf or the bottom), but a bored betta in a bare tank will look very different from a betta with plants, leaves to explore and a little training. See Enrichment and flare training.

Myth 13: "Lucky bamboo in a vase feeds the betta"

Verdict: Busted.

The idea is that the betta nibbles plant roots. Bettas don't eat roots; they're carnivores. Vase setups are also tiny, cold and unfiltered. Feed a quality betta pellet plus the occasional frozen treat.

Myth 14: "You can top up evaporated water forever without water changes"

Verdict: Busted.

Evaporation removes water but leaves waste products (nitrate) and minerals behind, so they concentrate over time. Top-ups are fine between changes, but you still need regular partial water changes. See Water changes.

Myth 15: "Bettas get lonely"

Verdict: Probably not.

Bettas are territorial, solitary fish. There's no evidence they need fish company, and many do best alone. If you want tank mates, choose carefully and have a backup plan. See Tank mates.

How we judged these

Sources

Read this in the app

All care guide pages

Care guide by Betta Gillfriend (Bespok Labs, BC, Canada). It is general information, not vet advice. If your betta is sick, ask an aquatic vet.

Privacy · Affiliate disclosure · Bespok Labs, BC, Canada