In a small bowl like this, the fish's waste will build up rapidly (espcially since there is no filter). This causes suffering (for example, eye and skin irritation), sickness, and even death. You can try to prevent this by changing the water frequently; however, frequent water changes are also stressful for the fish. (Not to mention a pain for the fishkeeper!)
In addition, the temperature of such a small volume of water will fluctuate rapidly; another source of stress for the fish. You cannot use a heater in a bowl this small.
In particular, this bowl is *not* ideal for goldfish and bettas.
Goldfish grow to be up to one foot long. Even when they are smaller, they produce a lot of waste. Goldfish need 10-20 gallons of water *each*, and they are schooling fish so you shouldn't have just one.
Bettas are tropical fish. They need a tank heated to 80F; there is no way to safely heat a tank smaller than 5 gallons.
If you'd like to care for a fish, please read some of the excellent websites out there and learn all you can. (Ignore manufacturers websites, since of course they will say their products are great, even crummy products like this one.) Get the largest tank you can afford. If you can't afford a large enough tank, please don't get the fish.My fish went from a flat front half gallon tank to this round one and hes never been happier. It is the perfect size for a beta. Lots of room to swim. The bottom shape is perfect for your rocks and plants because it leaves more room in the upper part for you fish to swim. I highly recommend it!

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