Fluval Edge 25W Compact Heater

I bought this heater for my 5 gallon planted shrimp tank. It fits perfectly into the tank, hides well in a corner (it is black, straight and designed to fit into a corner) and hands-free. No adjustments necessary and keeps my tank temperature well within acceptable range. Has a dim red light that is only visible when tank light is off. I like it that it is completely submersible and unobtrusive. Many of my friends have been impressed with its sleek style and the fact that it really doesn't look like a heater. If I felt like hiding it even more I could put it near the bottom of the tank, but I choose to leave it upright. My shrimp like to hang out on the top of it near the water's surface.

For the price, you won't find a better submersible heater for a small tank. Many would like to be able to adjust the temperature on the heater, but I have never had a problem with it. The suction cups will change color, graying over time, but they stick well and I haven't had any trouble with it as I have with other heaters.

This gets 4 stars because there is no thermostat; otherwise this is a 5-star heater.

BUY THIS ON AMAZON!!! Aquarium stores have to mark it up considerably.

***UPDATE December 2011*** The heater stopped heating my tiny tank. As this was a serious problem for my warm-loving shrimp, I went to Petco and bought a heater with an adjustable thermostat and I hate to say it, but I like the cheap adjustable one better. I won't be buying another one of these heaters. I reduced the rating to reflect the fact that my heater did not last more than eight weeks.

The heater is designed to only adjust the aquarium temp no more than 7 degrees higher than the ambient air temp. This is stated plainly in the instructions. Works perfect on my 6 gallon Fluval tank. It is keeping the tank temp at 76 steady. We keep the thermostat in our house at 70. Very nice looking heater, blends in with the tank background perfectly.

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Keeps the 5 gallon chi between 72-74. But I don't think my Betta minds. I've had the heater since December 2011

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I ordered this along with my 6 gallon fluval tank, and I take it out of the box and try to set it up, one this is the top suction cup was warped so it would not stick on properly, second the heater did not even turn on when I plugged it in, no light or heat. It was a complete waste of money. I have been trying to contact fluval customer support and they don't help me at all. Extremely dissatisfied. Every heater should be tested before they package it.

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Purchased for a 6 gallon fluval edge and have had for approximately 3 months. Liked the small size, look, and the fact that it was completely submersible.

It has been unable to maintain a temp over 74 with an air temp between 68 and 70. I added a digital air/water thermometer from my saltwater tank in addition to the cheap stick on thermometer on the glass to see if either wasn't working properly. I rarely see it running (based on the LED) and it seems most days the temp differential is between 2-4 degrees. I don't know if mine was bad or if it's just underpowered. Purchased a new 50w submersible/adjustable just now to see if I can actually get closer to 78.

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