08-09-2012, 03:24 PM
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The 25 or 50 pound bags of sand for <$4 at home improvement stores is perfect, put about half the bag in a 5 gallon bucket, and a spray nozzle on your hose... Blast the sand till it fills about 5 times. The 6th fill the water will look slightly milky, but will clear nearly instantly... that's what you're looking for.
Sponge filters are great for getting sand clouds out of water. I rarely have to wait more than an hour or two after putting the sand in a tank to add fish. Make sure you put the sand in, then a bowl, then fill with water. it really reduces the cloud factor.
Hope you have some happy corydoras to put in there ;-D