dividing sand and gravel - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 08-15-2008, 12:26 AM Thread Starter
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dividing sand and gravel

hokay well i'm about to go get SAS for my new 5.5 gallon i got today. i want to make a "river" using sand that i have, the thing is i know SAS is so light that it will float so i was planning on caping it with black gravel. how could i keep the gravel from going onto the sand. could i just stick in cardboard pieces and leave them there? or would i have to take them out once i'm done distributing the gravel.
TIA
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post #2 of 5 (permalink) Old 08-15-2008, 03:07 AM
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Seems that most people here use a piece of clear, flexible-but-sturdy plastic for this function. Trim strips to length, and have substrate settle JUST below the plastic's edge. There will still be some mixing, but this method seems to be widely used for this and to keep certain plants from growing where they aren't wanted.

Hope that helps. Perhaps someone else can be more specific...
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post #3 of 5 (permalink) Old 08-15-2008, 08:28 AM Thread Starter
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i understand what you mean, but where would i be able to find this plastic, or what kind of plastic is it.
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post #4 of 5 (permalink) Old 08-15-2008, 02:15 PM
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I use "Quilting Template" plastic I purchase at JoAnn Fabrics. Easy to bend, easy to cut - but plastic so it will not rot.

Personally, I would not bother to try capping the SAS w/ black gravel. Two reasons. First - although lightweight, once sufficiently waterlogged it will not really float. Secondly, because it is lightweight the heavier gravel will eventually work its way to the lower level underneath the lighter SAS.
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post #5 of 5 (permalink) Old 08-15-2008, 02:46 PM
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Vinly sheet stock would work as well.
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