I have two stacked 45 gallon tanks. Although my Marineland filter for the top tank is on the ground, it should be on the side, not directly below. The uniform length hoses that came with my filter didn't allow this, so I was able to purchase longer hoses to cut the hoses to non-uniform custom lengths. Heating the hose ends with a hair dryer helps a lot when connecting to the filter nozzles.
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