Just rebuilt and upgraded from my 72G bow front to a 90G. Been really interested in trying Bio Pellets, but didn't want to fork out the $$ on the Cad Light (even though they look cool) before knowing if it'll work.
I had a Phosban Reactor and variable pump sitting around and did this...
I basically flipped the reactor upside down and fed the pump into the normal "out". Then I put a 90 degree elbow on the "new" output that rests on the pump so it'll stand up. Also took the sponge out and put in a couple of screens. The screen was cut down to size so I took the extra outer material and made a "funnel" shape and inserted into the bottom as can be seen in the pic to even out the flow. The tumbling motion is very good! Now let's see if it makes a difference in a month or so...