Most Betta Fish Owners Get the Temperature Wrong, Here’s the Fix

Quick Take

• Betta fish's reputation as the perfect beginner pet is actually working against them in a serious way.
• A sluggish or slow betta isn't necessarily aging. Something fixable might be quietly killing it. See why lethargy happens →
• One small tool most betta owners skip could be the difference between a fish that survives and one that thrives. Get the essential tool →

Betta fish have gained a reputation for being easy, first-time-friendly pets. And while this is partially true, it also hasn’t done the species any favors. Bettas are synonymous with classic, round fish tanks, devoid of heaters, filters, or anything else that most fish require to survive in an enclosure. But the truth is, this does them more harm than good.

Bettas Are Not Room Temperature Fish

The biggest misconception regarding bettas is that they survive, and even thrive, at room temperature. The problem is that this fluctuates depending on the location, home, and even the area of the home. Some tanks may clock in at 65 degrees with the central air on, while others might soar above 75 with the heat on in the winter. Not only does this inconsistency stress your fish, but it also shortens their lifespan.

Bettas require a consistent water temperature between 78 and 80 degrees Fahrenheit. This is the sweet spot, promoting a healthy metabolism and digestion. Whereas some can tolerate water anywhere above 72 degrees Fahrenheit, this is not the ideal environment for a betta fish.

When temperatures drop below this, bettas become lethargic. They stop swimming around their tanks as much, and their movements decrease. This could be mistaken for an aging fish, but, more often than not, their behavior is temperature-related. This can also cause bettas to become ill, develop constipation, make them susceptible to parasites such as ich, and even die if the issue is not addressed quickly enough. The good news is this: There’s one easy-to-use tool that can keep your betta’s environment the appropriate temperature.

Introduce a Heater to the Tank

HOBs, or hang-on-back heaters, are ideal for betta fish. These heaters hang on the back of a fish tank and warm the water to your chosen temperature. The only things needed are an outlet and a tank large enough to hold a heater. Unfortunately, this means the classic fishbowl has got to go.

In addition to a heater, it’s a good idea to also procure a thermometer. While fish slow down overall in colder water, hot water can have equally devastating effects. Anything above 85 degrees Fahrenheit can quickly dissolve oxygen in the tank, causing fish to suffocate. Using a thermometer prevents this and displays the water temperature, so all you need to do is adjust it as needed.

There’s more good news: Heaters and thermometers are relatively affordable, and you can get both for around $20. Your betta will thank you!