Yes, its a Penguin BIO-Wheel 100 Power Filter. As shown here: http://ecx.images-amazon.com/images/...500_AA300_.jpg
As a temporary solution I have raised the U shaped tube because Caye needs to be in there stress-free, especially after suffering from finrot and ammonia poisoning before. But the Bio-wheel isn't turning and the lids don't fit. Do some research on the different filters before you decide to buy one.
WallyWest, the tube on mine fits into the other tubing just so that there is enough friction to keep it from falling back down. If yours isn't able to I'd suggest wedging something in between (so long as its not disturbing anything else including the water).