Aqueon Mini Fish Tank Heater 10 watts Black 3.58" x 2.25" x 6.85"

Got this heater for our beta fish named chickenhead 12th, he love it, great for a 2 gallon tank

My petsmart thermostat was off so I got this. Turns out my petco thermostat was more accurate. During the summer in California I don't need it on. It worked while it was plugged in and would come in handy once the fall and winter hits. has more accurate photos than petco, otherwise I would had just bought from the store to support then. Petco had an old outdated photo that showed more white paint on it than I would had liked.

I currently use two of these for two 2.5 gallon betta tanks. The most important thing to know about these heaters are that they do not shut off! They continuously heat the tank just like a simple space heater in a room. Eventually the water in the tank will reach a steady temperature. The final temperature of the tank is primarily based off of 1) The size of the tanks and 2) The temperature of the surrounding air. If you keep your room on the cooler side (roughly 66-70 degrees Fahrenheit) this heater should heat a roughly 2.5 gallon tank to a high-70s/low-80s temperature which is perfect for a betta. It could also work for a larger tank in a warmer room. Aqueon also produces 5, 7.5, and 15 watt heaters for different tank parameters.

Other notes:

- Extremely compact design
- One of my heaters runs about 1 degrees F warmer, though this amount of variation isn't an issue for me.

I have this heater in a 2.5 gallon tank. It seems to heat the water well for a small watt heater and my betta has been more active since I purchased it. Hopefully it holds up for the long haul. It's a well-priced & good heater for a small tank.

I bought this for our betta fish’s 5-gallon mansion mid-summer. Luckily I read the instructions before adding in the heater. Ambient temperature should not exceed 78 degrees. Our room was at 81. Had I not checked, our betta would have become boullabaisse. Since the start of fall, it’s gotten much cooler and our fish have benefited. It’s easy to use and keeps the water temp at a steady 81 degrees. So far, so good !