Deep Blue Professional ADB12881 Bettastik Sub Heater for Aquarium, Mini, 7.5-watt

This is a constantly-on heater, so the temperature your aquarium reaches depends on its size and your room temperature. It must be used with a thermometer to make sure you don't overor undershoot your desired temp. If room temperature fluctuates, so will the tank's. (The packaging claims it is "preprogrammed" but in fact there is no program or any temperature control.) It is a compact and apparently well-made device and can easily fit into a small tank. So far I have had no problems with it. It is able to bring my 2 1/2 gal tank up to correct Betta temperature in a 73F room.

This little heater does the trick and keeps my bettas warm and comfortable. The only drawback is that there is no light to tell that it is on, and .. there is no way to control the temperature. They are preset to only get to one temperature and that's it! My bettas were swimming in water that I knew was way too cold for them, and after I purchased two of these heaters, one for each bowl, they seem much happier and are definitely more active in the bowl. The cord hanging on the bowl doesn't look great, but you gotta do what you gotta do to keep your loved one's happy! My bettas look healthier since warming up the water with these heaters and the product has worked great. I have owned it for a couple of months and have had no trouble. The water doesn't overheat and I have about a 1-1/2 gallon decorative bowl (one for each betta)set up with live plants and decorative colored stones. The heater works well -I only wish I could control the temperature and that it had a light of some kind to tell me it is on and working -now I have to place my hands on the glass or look at the thermometer to tell that it is on and doing its job. Just to have a little red light that I could glance at from across the room, telling me that the heater is on and working, would assure me that my fish are warm, instead of having to check the thermometer or feel the glass. I would recommend this product to a friend and a family member to purchase.

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I love the look and simplicity of these, and now have 4 of them for our several small tanks. We bought 7.5 watt, 15W and 30W versions, and put them in tanks of the appropriate size (1-6 gallons).

I've noticed that one tank near our radiator is running 82-83 degrees, so I put a lower wattage one in. Same thing, 82 degrees.

Apparently these are NOT "Pre-programmed" with a set temperature in any way. They're just always on.

This means that the will keep your coffee piping hot if you stick it in a small mug, or keep an aquarium sorta warm, depending on the size of the tank and the temperature of your house.

Since all the Heat Stik and Betta Stik heaters we bought all look identical, with no markings to show which is which, I bought a digital electrical meter today and measured them: 7.5W, 7.5W, 7.5W, 7.5W....

They're ALL THE SAME. So not only is the idea of a preset thermostatic control complete bunk, but they're packaging the same product as different things.

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This heater has kept my betta warm in a 1-2 gallon tank with a room temp of 65 degrees for several months now. The only annoying feature is there is no auto shut-off, so I do have to watch it if the ambient temp goes up (not very often in Seattle).

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I thought this would be great for my tiny desk aquarium, but there is no off switch. So, when left on, the water temp went to 86 degrees. When off, it fell to 68 degrees. So, I purchased a timer. It has "teeth" every 1/2 hour that you can set to go on or off. So, I set the heater to go on and off for an hour at a time every 24 hours. This seemed to do the trick and the water temp is at a constant 80 degrees now. That's all you need to do for this product to perform perfectly!

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