Aqueon Small Aquarium Fish Tank Submersible Mini Flat Heater Up to 5 Gallon Aquariums, 10 Watts

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.

Works great! My betta fish is much happier now that the tank is warm. Its a 2.5 gallon tank amd so far has kept it at about 80 degrees.

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. Amazon 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 Petco had an old outdated photo that showed more white paint on it than I would had liked.

Didn’t work at all. Followed instructions and it never heated the water. That’s too bad cuz it was just the right size. It’s small and doesn’t take too much space. The suction cups worked well. It has a nice sleek look and seems like strong material. It didn’t work to heat tank though.

I ordered 2 of these for my 5 gal betta tanks. I have 2 more of these at home that I use for my other betta tanks. These things are a hit and miss really. One came non working, the other heated my 5 gal tank to 82f. The non working one I’m returning for a replacement. The working one that wants to boil my betta I’ve placed into one of my 10 gal tanks and now it keeps it at a stable 78. If you are going to use these, please remember to let it sit in your tank for a few hours before plugging it in. Then only do so when you are available to monitor the temperature change. These things DO NOT shut off. They just keep heating. I do not suggest these heaters for tanks smaller then 5 gals. They seem to function best in my 7 gals aquariums.

This heater is great for a small tank. I have a 2.5 gallon tank for my beta. It suctions to the side with two little suction cups. It warms the water, and my fish likes to swim over and snuggle up to it. Only problem is I have no idea how hot it is. It was cheap, so there’s no temperature gauge. I just check the water periodically.

Works

Looks good