It looks nice and it heats my 29 gallon tank great. It hovers above the gravel line and the “water line” indicator and my tanks water line are exactly a perfect fit. It stays put, though the suction cups should be on longer stems.

It works ok, but there's a constant fluctuation in temperature of +-5 degrees. The thermostat in this thermometer is pretty useless. Looks like it has a built in thermometer, but it is just the temp setting.

Terrible product, very cheap. It suggests you cal an electrician if you do not have a gfi outlet.

The fluval e-series is the best aquarium thermometer on the market. I have a 30 year old 44 gallon fresh tropical water pentagon shaped aquarium. In my 29 gallon high, the 200 watt works great.

Led back-lit lcd display is nice and makes checking the temp very handy. Microprocessor control makes setting the temp easy, as well. Lighted digital display in tank is a bit unsightly, but it is easy to read.

Took me a while to finally purchase this due to all the bad reviews. I'm sure many have had defective units but these heaters are wonderful when functioning properly. I've never had that issue, so i think it's more about aesthetics than anything else....  Read More

It never fluctuates. Turning it down to 75 is fine, but since it will reset to 77 automatically after being powered off (or a power outage), that's somewhat annoying.

No problems with lf (low flow) warnings on the display or wild heating or cooling. I have to buy and place a wavemaker close to the heater and problem solved.

I suspect this was simply a faulty unit as i have a fluval 306 filter. Temp reading is always off.