cloudy tank

Okay my tank cycled for over a month. I add some fish (6 cichlids) but while my water paremeters where fine my tank water is cloudy. Why is it so cloudy? Im using a canister filter has a course filter pad, fine filter pads, carcoal, and bio rings. I cleaned the canister before i added the fish. what can I do?
tank specs:
90 gallon
sand substrate
2 flower pots
1 green rock cave
3 green terrors
3 JDS



stephen

thanks for the info. any one else have any other input .