I don't personally use a power head in any of my tanks. There are a couple reasons somebody may use one though. The first one that comes to mind is as a method of diffusion for CO2
. You can simply plug the CO2
tube into the power head intake and you have instant diffusion. Another reason is for the needs of fish. Some fish that are from fast moving streams, etc. appreciate extra water movement.
As for your water being cloudy, what kind of food are you using? I've used Tetra flake food and NLS .5mm pellets and haven't had any cloudy water issues.