09-25-2011, 11:05 PM
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Also, i dont think anyone mentioned this yet, but sand has a tendency to compact. This means that areas, especially those away from live plants or under big decorations, can develop anaerobic pockets more easily. Although anaerobic pockets are good for biological filtration, if they are disturbed, they will release hydrogren sulfide into your tank which is poisonous. This means with sand, you must regularly poke the substrate to make sure its aerated enough and to release any small pockets of gas that forms so that there won't be a buildup that could be dangerous to your fish. Introducing inverts like MTS will also help avoid this problem.