Cloudy water-what are the causes

[chevcam]

I have noticed the last couple of days my tank water seams a little cloudy.
I did water test today and every thing is great. ammonia 0 nitrite 0 nitrates 20 and ph 8.3 I only feed once a day they seam to consume it within 2 to 3 minutes. 2 damsels one clown trigger 90 gal with LR 50 gal sump with wet/dry and mag 350 canister filter with carbon. any suggestions would be great!

 

[krux]

it could be an imbalance with alkalinity and calcium, or it could be a bacterial bloom, possibly a couple other causes. if it remains a problem, you might want to test for the above if you have the test kits... bacterial blooms tend to go away on their own if that is the problem.