Freshwater Aquarium/Tank heaters


Would it be ok to put a 1-3 gallon 7.5 watt aquarium heater in a .5 gallon acrylic tank?

I have a betta in a 1 gallon tank. Unfortunately, being in college I have to take the fish with me on weekends I go home. A gallon tank is difficult to do that with so I have a half gallon acrylic tank for those weekends, but as the temperature drops I realize I should get a heater and cannot find any for tanks smaller than 1 gallon.

Hi Jackie

That would be fine for a .5 gallon tank. However, a smaller tank will heat up faster, so use a thermometer to keep an eye on the temperature. If it goes above 82, you'll need to either turn the heater down or unplug it for a bit.

Hope this helps you, good luck!


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Richard Hight


I own and maintain several freshwater aquariums from 2 to 180 gallon. I can answer most questions about freshwater aquariums, including setup, cycling, maintenance, compatible tank mates, feeding. Moving? I've moved fish both across town and across the country and can help you get your little aquatic friends to their new home safely. I know and have experience with most freshwater community fish, South American Cichlids and African Cichlids. I don't answer questions about Goldfish or keeping Goldfish with Tropical Fish. I also don't answer questions about keeping crustaceans (shrimp, snails, crabs etc) with Tropical Fish, nor questions about saltwater fish or aquariums. I'm not available to answer questions on weekends, this is when I do maintenance on my own tanks.


Many years of personal experience with community tank fish, semi-aggressive fish (Barbs, Tetras, etc), Angels, South American Cichlids and African Cichlids.

HSG 2010-2011 prof

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