How to Heat a Small Fish Bowl | eHow

A 7.5 watt Slim Heater is ideal for your betta or small fish bowl 2 to 5 gallons in size
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They don’t offer enough swimming space. Betta fish grow up to 3 inches long and goldfish can grow much larger. A small fish bowl simply doesn’t offer enough swimming space to keep a fish healthy.
We suggest a 5 gallon tank for the happiest and healthiest betta fish. Small tanks and bowls are not .
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Bettas are a tropical fish, requiring a water temperature between 75-82ºF. With small aquariums, this water temperature can often be accomplished by positioning the aquarium under a desk lamp. In cooler homes/workplaces, a BettaTherm heating pad can be placed under small bowls to increase water temperature or the Mini Heater 10W can be submerged in the bowl or tank to increase the water temperature. The Mini Heater is a great choice for classroom or work Bettas because they turn on and off automatically to maintain a consistent water temperature (especially important if the building’s heat is off for the weekend). Having an aquarium light on for several hours each day can promote algae growth. However, aim to maintain an approximate 12-hour photoperiod using natural lighting, house lighting, or a nearby lamp, turning lights off at night to simulate a day and night cycle. A 7.5 watt Slim Heater is ideal for your betta or small fish bowl 2 to 5 gallons in size.
Photo provided by FlickrDec 18, 2016 - 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.
Photo provided by FlickrJan 20, 2017 - They're the only fish that don't require a filter or heater and can be kept in small bowls
Photo provided by Flickr
Fish, especially Betta, do not do well in bowls. Unfortunately, Betta fish are put into containers much to small for them to be happy or healthy. Many "Betta Bowls" are horrible at keeping fish. Bettas need a MINIMUM of 3 gallons (11.4 L) of water (5- 10 is ideal but the more space the better in most cases) with adjustable heating, and filtration. If you set up an aquarium that meets these requirements you will have a happy and healthy fish.Fish-keeping has evolved over centuries, from small vases and bowl to the high-tech aquariums of today. Unfortunately, some fish-keepers haven't advanced along too, and still keep their pets in the dreaded fish bowl. Ironically, fish bowls are not suitable homes for aquarium fish, whether they're goldfish or bettas or any other animal. The Essential Goldfish: Total Care, Housing, and Feeding Your Goldfish, Keeping Your Pet Healthy, Breeding by Maddy Hargrove says about the fish bowl- "A muddy puddle in a deep pothole would probably be better." And for many reasons:Even though awareness on betta fish care seems to be slowly spreading, both pet stores and the internet are still an enormous source of misinformation. Betta bowls, vases and tiny “aquariums” are still sold on a large scale, which means many unfortunate bettas die a premature death due to bad housing. Even though bettas are very small fish and often quite cheap, they still need to be kept in a heated, filtered aquarium to thrive.Keeping a betta fish or goldfish in a small fish bowl is equivalent to soaking in a bathtub contaminated by your own waste – there simply isn’t enough water to dilute the waste. The key to keeping aquarium fish healthy is to maintain high water quality in the tank, and that simply isn’t possible with a fish bowl unless you change the water every day. As your fish eats, it naturally produces waste and in a fish bowl there isn’t anywhere for that waste to go. As a result, it accumulates in the bottom of the fish bowl where it will have a negative impact on water quality. If you don’t change the water in the bowl, the accumulation of wastes can quickly lead to toxic conditions which could kill your fish. This is why many goldfish only last a few days after being brought home from the fair.