Have a new 29 gallon and bought a 25 lb. bag of leveling sand. It is a darker sand with small stones in it. Put it in the aquarium and the water is cloudy and has been for the past several hours. The sand was washed well prior, but of course all the dust cannot be taken away. We've changed the water a few times and let it run through the filter, but it's still cloudy. Will this substrate actually work or do we need to empty the tank and start all over? We would like a dark sand, not beach white sand, with stones in it and can't see spending $15 for a bag, when they sell practically the same thing at hardware/home stores for $3. Any help or suggestions would be appreciated.