See How to Take Care of a Betta Fish for all of the details.

May 4, 2007 - Cleaning a Small Betta Bowl | Betta Fish Care for Fighting Fish Enthusiasts.
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Hi, I find this article very helpful, but I just got my betta fish yesterday. I know for the most part on how to take care of them I just have not had one before. Someone got this for me so I would really love to have it happy with its new home. As of now, I have him in a 1gallon bowl without a heater or filtration. I have one little plant and some pebbles. I really think I need to at least get him a two gallon tank, but I do not have much space. Could you give me some tips on bowl cleaning, feeding, water changes, or anything else I need to do to make my fish happy. As of right now he does not look very happy. Any recommendations will be truly appreciated. Thank you.
Betta fish glass bowl ideas and care tips to keep your betta happy and thriving.
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There has been some controversy surrounding the practice of growing a peace lily in a bowl with a Betta fish. Take care to ensure that your Betta fish has plenty of room to swim around the roots and enough space to rise to the surface for oxygen in order to keep your new pet healthy. Sep 21, 2009 - Heating Small Betta Fish Bowls | Betta Fish Care for Fighting Fish Enthusiasts.
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Photo provided by FlickrBettas are frequently marketed as bowl fish who require little to no care, but bettas require ample space and plenty of oxygen in their water
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How often should we clean the bowl? Yesterday we took him out and I scrubbed the bowl with anti-bacterial soap and put fresh, room temperature water in. I don't know about all of that stuff having to do with putting stuff in the water to change the PH and stuff...although I never saw the old roomate do that, and the fish was still alive. She did have another Betta that died though, so I don't know if she was taking care of him okay.Betta Fish have also been termed “Siamese Fighting Fish” due to the male’s aggressive, territorial behavior. Typically, males housed together will posture (face one another with flared fins and gills), and may even attack each other. As a precaution, it is a general rule of thumb to house males solitarily. Female Bettas, on the other hand, do well when kept in multiples; a group of female Bettas is called a “sorority”. Betta Fish are naturally found in rice patties, canals, and small streams in Asia. This species of fish does remarkably well in small aquariums of stagnant water. Because they excel in bowls and small aquariums, Bettas have become the perfect fit for the classroom, workplace, bedroom, or kitchen countertop. While wild Bettas are typically brown in color and exhibit short, plain fins, Bettas have been selectively bred in captivity to enhance desirable color and fin characteristics. Pet Bettas have come a long way and there are now many beautiful color and fin variations on the market today. Betta fish are very hardy and easy to care for, making them a simple pet to brighten almost any space.One important factor in betta fish care is to use a container that allows the fish to swim around a bit. Bettas can of course survive in the little jars they are often sold in, but this is far from a healthy environment and bettas in such tight quarters may fade in color and become sluggish. Bettas don't need a huge amount of space, but a little room to swim, and a decent amount of surface area for the fish to get gulps of air in are recommended. As a suggestion, a 1 to 2 gallon fish bowl is a good option.I have had my betta for a few months now. Freddie lives in a two gallon fish bowl. I have two gallon jugs that I fill with water, a couple of teaspoons of aquarium salt and seven drops of TetraSafe in each jug and leave the lid off. I fill these jugs up as soon as I use them for water change so they have the added advantage of leaching out chemicals, chlorine, floride, etc. as well as possible and always having water that is the same temperature as what Freddie is swimming in. I have a number of small aquarium things like different sized marbles, small mirrored marbles, medium sized rocks, a small cave and some plastic plants. I vary how I decorate his bowl with each change using things interchangeably. Once I just stuck a blue drinking glass in the bowl and he had a blast swimming in and out of that once he found the mouth of it. Freddie seems happy. He swims around freely often and often explores swimming through the large marbles I have. He enjoys taking his nose and shooting the smaller marbles around making the glass clink at night. I feed him TetraBetta, but it is too big for his mouth so I put some in a little 4 x 4 baggie and hit it with a hammer once keeping it in a pellet but a smaller one that will actually fit in his mouth. I have kept aquariums for elementary schools for many, many years, big ones, small ones, whatever the teachers wanted me to take care of in their classrooms as well as one very large one in the school's lobby. But I do not now. It's a great way to get problem children to behave. When they behaved, they could help me with the aquariums and the children clamored for it. I also kept a good sized goldfish pond in the school's courtyard. I usually kept cichlids and selected really colorful ones in the lobby and big goldfish in the courtyard as they are easier to keep and colorful. My Freddie's bowl gets a slime on the top of it within 4 or 5 days and it is usually objectionable to me, and it also appears to bug Freddie too as his activity slows down and he hovers near the top when the slime is more visible. The clearish, white slime is on the surface of the water. By the time the bowl is a 3 to 4 days old the slime is gross. By 6 to 7 days it is downright disgusting and Freddie is very much less active, so I change out his water around every five days. I have it down to a science and can do it in 15 minutes now. Can you tell me what is causing this slime to develop on Freddie's bowl. I do not use a filter, fine substrate or a heater in Freddie's bowl as I live in the South. What can I do to keep the slime from developing so fast? Or at all? (Sorry so long. I am a writer and find it impossible to stifle myself. :D )