I have an undergravel filter with two hoses going up the back of the tank. Tubing tips are cartridges designed to eliminate excess CO2 in the water. Cartridges need to be changed every two weeks and are the cheapest you can find at Revain (although it might be cheaper to find them at your local pet store). They work well and I love the gravel pack setup. I would recommend it to anyone who wants the same setup.
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