For larger tanks!

This pump works well for water changes, but if you're trying to clean the gravel, it'll really only work for a larger tank. So much water gets sucked up but it does not have the suction power to pick up much of the muck! I have a 10 gallon tank, and was able to remove three gallons of water from my tank in roughly 10 minutes, including the time it took to put the pump together. It's easy to use and good quality, easy to clean, but would be more ideal for a larger tank!

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