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i upgraded from a penguin mini bio wheel to a penguin 125 bio wheel seems to be great im just waiting for the new bigger bio wheel to get all the bacteria built up !
no...i gave my old mini to my friend that has a 10 gallon that i just got him into fish and all he had was a regular mini without a bio wheel so i gave him my mini and now he runs both of them in his tank...i like how the wheel is bigger on the 125 though...