Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Too small to keep your betta healthy and happy

Please do not buy this bowl for a betta.Firstly, it is difficult to keep the water at a good temperature. Bettas are tropical fish and like warm water (I keep mine at 80 F). A heater cannot be used in a bowl this size, and since it is so small the temperature will fluctuate more rapidly than a larger tank.Secondly, it will require frequent water changes. Not only is this annoying for the owner, it is stressful for the betta. If you don't change the water frequently, the fish's wastes will build up and make your fish sick.Thirdly, this bowl does not give the betta enough room to swim.