02-12-2012, 07:48 PM
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A while back I was lured to the dark side of the benfits of the 'deep sand bed' even without living plants... so I added [pool filter] sand to my fine [natural] gravel substrate. With the exception of a deep layer, the sand filters down below the surface gravel. To a point, you could create a sandy area, but Gwen is right, in time it will mix. You can try it and if it doesn't work, you can always tear it down later to remove the gravel and switch to all sand.