cloudy tank help!!

[aquaticdesignsfl]

maybe some one can help me. I have a 180 gallon tank that is consistantly cloudy. The Aquarium has been re set up for just over 2 months and has been done with it's cycle now for over a month yet it remains cloudy? There is no nitrite, ammonia, nitrate is @ .20 and ph is 8.2 I have 2 lg damsels, 1 lg soho tang, 1 yellow tang, a huma triger, spiny puffer, and a med red hermit. I have tried a 50% water change to no avail? some one please help

 

[diceman]

Cloudy water could be several things. If I were you i would take a water sample to your LFS and have them test it. My cloudy water problem I had once was due to a bacterial bloom. The water was almost white like milk was poured into it. The LFS told me that a UV steritizer would fix that. Im my case it cleared the water up overnight. I know that many on this board don't like the use of a UV sterilizer because it kills good bacteria also, but it did solve my particular problem with cloudy water overnight and has since been very clear.