I have a 150g tank 2 fx5's. i tried positioning the nozzles in every direction but there is still a dead spot in the middle of the tank. So there is dust or oil floating in the middle of the tank. Should I use a powerhead to aggitate the water more? If so which one should I use? Any Suggestions??
On my 150 gallon I use the Aquaclear 110 Power head. Here it is at work in my tank. http://youtu.be/ghKw2bckGag
With that being said regardless of the collection in the middle all your water in being filtered. What it is is that in the middle due to water movement that is where it is collecting. The power head pushes water almost 6 feet. I have been using them for about 10 years and I never even had to replace an impeller.