This is a small bubbler I bought for my goldfish tank. I would say it fits up to 5 gallons. So far my fish love it and it really makes my tank look bigger. However, it's super easy. The force of the air going through the bubbler tips it over, requiring you to constantly adjust it. I bought some suction cup holders to hold it but even then it shifts and moves again. I would recommend putting weight on the floor. Maybe stick stones on it or something?
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