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I have a tank set up as follows, I have two holes drilled in the bottom of the tank with a bulkhead installed in each hole, attached to the bulkheads are hoses with a shut off valve inline, attached to the hoses are two canister filters. Inside the tank is the grate for an undergravel filter, there are no tubes or air stones attached to the undergravel filer in fact the holes for the tubes are capped. The the under gravel filter works like all undergravel filter except everything that is sucked into the undergravel filter doesn't remain there, it gets sucked into the canister filters underneath. Everytime I do a water change I attempt to vacuum the gravel but nothing comes out but clear water.
 
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