Small tanks or fish bowls can be a real challenge to heat properly. Fortunately, there are small heaters are available in a variety of types. Check out these heaters specifically designed for mini aquariums or bowls.
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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 safety shut-off if not submerged in water. Costs a bit more than the flat heaters, but it's a quality product.
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A relative newcomer, this pre-set heater has been well received by owners. At a mere 7.5 watts, it doesn't put out a lot of heat, but for most Betta bowls, it's perfect. The price won't destroy your bank account, either.Continue to 5 of 5 below.
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Available in 5, 10 and 20 watt versions, the Cobalt is fully submersible and shatterproof. Like other mini heaters, there are no adjustments. A bit more expensive than some models, but it also is more durable.
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