05-31-2013, 09:35 AM
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In one of my current set ups i already have a similar layering going on. At the bottom tyho is a large gravel, this was mainly for bulking out purposes as it reduced the cost for other materials. On top of the pre mentioned gravel was an aqua soil then capped with sand, not had an issue with it.
Im willing to try new things, a case of trial and error, If the gravel between soil and sand became and issue it would be easy to solve using a strainer. Thank you for your input and it has been taken on board