Reasons for cloudy water?

[bobblehead27]

I work at a pet shop and one of the most common issues is cloudy water and I was wondering if I could get a list of possible reasons and perhaps their solutions. I know a couple but I doubt all

 

[Owain4]

i find bacteria bloom to be the cause most of the time when i have cloudy tank issues. http://www.fishforums.net/index.php?/topic/246850-bacterial-blooms-explained/

 

[golcondorus]

I would say for a white cloudy tank it's a over proliferation of bacteria due to a uncomplete cycle or too much waste. Green is obviously algae


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[bobblehead27]

So a good water change using a gravel vac will clear it up?

 

[Cyden8]

More water change.

 

[Chromobotia]

Lack of sufficient mechanical filtration. 25 micron filter pads work wonders.