There is some good info here. Here is a technique that I have used... successfully.
* If you have any other tanks in your home, switch the filters; containing 'known good' bacteria. The 'used' filters will cycle the tank fast. Plus, there will be enough bacteria in the water from the 2nd tank to 'kick-off' the bacteria in the new filter. Switch the filters back, when the cloudiness clears.
* If not, go to your lfs and have the 'squeeze' their sponge filters into one of their fish bags, then insert the 'intake' tube of your filter into the plastic bag and let the filter suck in the bacteria.... don't pour the bacteria into the water, this is less affective.
* New gravel/substrate and tank decor can contribute to cloudy water. You may want to soak them in a bucket/tube of water, until the cloudiness clears.
* Having fish in your tank is good, but in most cases very bad on the filter and water quality, not to mention bad for the fish. I would suggest reducing them down to one to three and feed less; small amount once a day.
I hope this helps!