+1
I hang one on the end of the aquarium, four footer, Aquaclear 300 on 75 gallons. I had one on the end of my 55 gallon too, a HOT Magnum... had these setups for years with no problems... I actually think it is better to circulate the tank length rather than front to back in one small section of the tank...
Granted I also run another filter in the center rear of the tank, though... But that Aquaclear 200 should do fine in a three footer.