Fluval Nano Aquarium Heater, 25 Watts

Works fine. I got this for my quarantine tank. im setting up for my betta fish.

The heater feels great. Doesn't feel cheap or flimsy. Suction cups are solid. No adjustment on temperature, which is stated in the description. But I think in general must tropical fish need to be in 78 degrees water temp. So it great not messing with setting. Just plug it in and forget.

I have had two of these heaters. One failed at about 8 months. The second has now failed at approximately 1 year. I love the heaters when they're working. Small compact, durable,and easy to set up with no adjustment required.

I got this heater after returning few heaters for my 2.5 gallon tank. It works well and doesnt take too much time for the tank to be of same temp. I am hoping I would be able to use this heater for a longer duration.

It's really hard to find a good and safe heater for a small 5 gal. that wont cook the fish or do pretty much nothing. This heater does all it's expected to do. I love not having to worry about the issues the wrong heater can have on my tank and fish.

Small, reliable, nice profile in a rimless tank.

I got this heater for my office 5 gallon. The building/office is extra cold during the winter, so I went one size up. I like that this model has an indicator light showing when it's on and heating. A couple weeks in and the temperature is still perfect.

I purchased this for an 10 gallon feeder snail breeding tank. No problems with it and it has been several months into the purchase.

I ordered this for my 5 gallon tank that houses my Betta, two mystery snails, and some ghost shrimp. Unfortunately, the item I received heated my tank to 82 degrees. I contacted customer service and they were very quick to respond. It sounds like the item I received was just calibrated incorrectly, but they sent out a replacement immediately and that heater is working great and maintaining my tank at 79-80 degrees. Great product and amazing customer service!

Using it to heat my 5 gallon snail tank that's on a windowsill, and it's been doing a good job at keep the water temp steady at 78 degrees. I have this heater on a thermostat in another 5 gallon and I have no complaints.

Currently using it in my 5 gallon tank. Temperature is consistently 79 degrees. The heater is black and very inconspicuous; you can barely see it in the back of the tank (tank does have black paper behind it).