sorry but i think that your reliable source is completely wrong, i have play sand in and my water is crystal clear and it does settle - look at my pics...these were taken when the tank was at its messiest as you can tell from all the poop...but the water is crystal! (Also notice the 40cm catfish in there....no stir up!!)
Another thing about your tank...if your using sand you should only have 3/4cm deep!! if you have deeper you get some nasty bacteria forming a black layer about 2cm down, and if you disturb the sand the smell is like someone has just farted directly into your nose...
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Ya I personally never even said I was using play sand. The sand I had bought was so fine it was damn near dust.
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