White cloudy or green cloudy? Sometimes its hard to tell unless you look at some tank water in a clear glass.
Bacterial blooms, (white cloudy) and algae blooms, (green cloudy), are nothing to be concerned about in themselves but you've got to be 100% certain that your water parameters are where they should be. White cloudy water can indicate an ammonia spike and algae blooms often occur when the tank is over-stocked, the fish are being fed too much or the water changes are not being done on a regular enough basis. If your nitrate is over 40ppm then you're more likely to get an algae bloom.
My advise to you is to double check your ammonia, nitrite and nitrate readings and then if they check out continue to do small DAILY partial water changes of 20% and see if that helps the cloudiness. Rinse your filter media out in a bucket of tank water every couple of days, too.
How are your fish? How many fish and what size tank?