Who Gives A Fish Forums

For real. It's wild how much of a difference a heater makes. My betta went from barely moving to zooming around like a little rocket. Totally worth the $20 or whatever.

Gonna echo what jake said. A good heater is a game-changer. My betta was super lethargic at 72F, but perked right up after I bumped it to 80F. Also, avoid those preset heaters, they're sketchy.