AquaMiracle Adjustable 10W Betta Heater Small Aquarium Heater Submersible Fish Tank Heater 5V/2A USB Powered Super Mini Aquarium Heater with Digital Display Thermostat, for up to 1 Gallon Tanks

Tiny yet mighty!
Sam, our unexpected Betta fish birthday gift for our 7-year-old, quickly became a beloved member of our family. To ensure his happiness and comfort in his new home, we had to learn the ropes of Betta care. It was surprising to discover that these little fish, often sold in deli containers at pet stores, require a considerable amount of care. During our research, we learned that Betta fish thrive in water temperatures between 78 to 82 degrees Fahrenheit, and achieving this meant we needed 5 watts of heating power per gallon. That’s why we found the 20-watt heater to be a perfect match for our 4-gallon tank.This compact heater was an ideal solution for our uniquely shaped round tank, where our only option was a fully submersible heater. Many other models we came across were bulky and had no suitable attachment points. However, this heater’s strong suction cup allowed us to discreetly position it near the rim of the tank, preserving the tank’s aesthetics. Not only has it maintained a consistent water temperature of a perfect 80 degrees, but it’s also safe to touch, as Sam often swims close to it without harm.One feature we appreciate is the easily visible digital display, which helps us monitor the temperature and ensure Sam’s safety. However, my one concern is the auto-shutoff setting, which is set at a rather high 97 degrees. Knowing that Bettas cannot survive in water temperatures exceeding 86 degrees, I can’t help but worry about the possibility of returning home to an overheated tank.

Nifty, Fun Aquarium Heater!
I got my first of these Heaters near a month ago for my 1gal. Betta bowl. Nifty (neat and easy to use), it’s been a perfect fit for the compact bowl space, with a digital control combining thermostat (to set the desired heater temp) and thermometer (to show the actual aquarium temp).Loved it so much, I then got a second one, this for my cylindrical 2gal. community tank which is home to six Guppy/Molly/Platy fishes. Yes, it is overcrowded but I closely monitor the tank’s water quality and other parameters as well as the fish behavior there. And all the guys are doing well, as shown by their feeding habits, mobility, even schooling activity.Relying on these Heaters for keeping both of my minimal aquaria at an optimal 80°F I’ve felt confident that all is well. Until the last day or two… my apartment has cooled somewhat from its usual 75°F or so down to 68°F, nothing drastic. Yet the two heaters now seemed taxed to hold their spaces at the 80°F I’ve set. Each aquarium now hovers at 74°F, shown by the controls of each heater and verified by strip thermometers, one on each aquarium located up against the heater (at least for the Betta bowl). This is a mildly troubling issue on which I will update this review if warranted.

Nicely adjustable…
Works well for my little 2.5 gallon nano tank that I use for a beta and plant. And that it is digitally adjustable makes it even better. Also comes with a suction cup clip to attach inside your tank. Don’t expect major temp changes but it will adjust up a few degrees in 5 gallon or smaller tanks. The heating glass is exposed so be sure your fish/snails/shrimp/critters can easily get away from it’s glass if it kicks on when they are attached to it.Nice little heater that’s easy to setup and use with big temp numbers you can see from across a room.For very small tanks only.

Si me gustó y por eso no lo devolví. Muy preciso, se puede usar para un nanoacuario. Es muy pequeño. Los que ponen mala nota es por que no saben usarlo. Lo recomiendo

No duró más de dos días cuando explotó dentro del nanoacuario, al parecer el cristal no es de buena calidad o venía defectuoso

muy lindo, solo que tuve que comprar el de 30 w porque el de 10w no me iba a servir. en general es un producto lindo y práctico