today i bought a Penguin 125 bio-wheel "aquariums up to 30 gallons" for my 20g aquarium freshwater .i used to have an undergravel filter but i want to take out my gravel and put in some sand instead. are there any other uses for my powerhead? im giving away theundergravel but keeping the powerhead. its a powerhead 2c1. any other uses for it? thanks. all advice taken.
any uses for filter ?!!?
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