The rule, as tarheelz mentioned, is usually 1 inch of fish per gallon.
The reason many tanks go cloudy, despite proper cleaning and filtering, is simply over-feeding. Be sure to ask someone at the petstore how much food your fish require per feeding, don't necessarrily trust the instructions on the food.
Fish will often eat as much food as you give them, but this just means more ammonia in the tank in the form of fish feces.
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It is the mark of an educated mind to be able to entertain a thought without accepting it.
-Aristotle
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