Hi there,
Your profile says new but how new? Also how cloudy, like soup or just a bit misty.
Have found in a lot of the tanks I set up that quite a few times within the first 3-4 months the water loses some of its crystal clearness and goes a bit misty everynow and then. This is generally down to a bacterial bloom as the tank gets used to coping with its bioload in the tank.
Depending on how long that tank has been up, you have a fair number of fish in there so your tank my not be 'mature' enough to cope. Have you tested the water recently for ammonia/nitrite/nitrate? Always useful when trying to work out causes of problems.
If it is a bacterial bloom then chances are it will just clear up in a few days, I've run the lights a little less whilst its on, however I have tended to be more lightly stocked than you are so you may need to increase filtration to cope with the numebr of fish you hve in there.
Interesting to see other peoples comments and hear about the details on your water and the cloudiness from you....