I purchased one of these a few months back for my 50 gallon tank. It really didn't seem to move much water, so I thought that it was perhaps defective, and took it back to Wal-Mart for an exchange. But, with the second one, it was the same result. I ended up just taking it back for a refund. Here's what I think that the problems are: 1. The motor with the impeller is just too small to move a large amount of water thru 2 filters, plus the black foam inserts. Within 2 days, even with relatively clean filters, the water slows to a trickle. 2. Once the water line drops below where the tube joints are, they must not have a tight enough fit, so air gets in there, making the water flow even worse, if that's even possible. AquaTech needs to either beef up the motor to move the proper amount of water, or have 2 seperate motors, one for each side. In my opinion, do some research, and purchase something else that works MUCH better than this piece of junk.
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