This aquarium is too small for betta or goldfish. There is very little space for swimming. A heater cannot be used in such a small aquarium, which is important for bettas, which are tropical fish. Fish excrement accumulates quickly, so you need to change the water quite often. While the bettas are small, the goldfish will quickly outgrow this tank. If you want to keep pet fish, do your research and find out how you can meet their needs.
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