Small tanks or fish bowls can be a real challenge to heat properly. Fortunately there small heaters are available in a variety of types. Check out these heaters specifically designed for mini aquairums or bowls.
Hydor Mini Heater
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Avaialble in 7.5 and 15 watt sizes, this flat, fully submersible heater is a great choice for a small tank. It fits flat against the side of the tank, or better yet, under the gravel bed. The price is also fairly small. Ten dollars will get you the smaller version, which is perfect for a Betta tank or bowl.
Zoo Med Betta Therm
Zoo Med specliazes in reptile needss, which require a varitey of heated products. They bring that expertise to the Bette Therm, which is a flat round heater, designed specifically for the bottom of a Betta Bowl.
Marineland Mini Heater
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Marineland makes solid products, and this one is no exception. It is a mere 5 inches long, shatterproof, preset to 78 degrees, and has an automatic saftey shut-off if not submerged in water. Costs a bit more than the flat heaters, but it's a quality product.
Hagen Elite Mini Submersible Heater
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This is one of the partially submersible heaters, so keep that in mind. It is small enough to work well in a 2 to 5 gallon tank, but is not suited for a Betta bowl. Comes with a temperature set dial, and suction cups to attach to tank.
