The Planted Tank Forum - View Single Post - Tips on 'scaping with both sand & "gravel"?
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post #7 of (permalink) Old 10-21-2012, 04:41 AM
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I use the black expanding foam that is made for ponds, and 'mortar' together some rocks. This makes a divider that looks more natural than the plastic strips, and works just perfectly because the foam sticks just fine to glass and to rocks.

Any 'sort of' divider like a row of rocks with no 'mortar' is going to allow the substrates to mix. I just took down a tank like that. Pool filter sand and Soil Master Select. Totally mixed because the row of rock were just that, nothing between the rocks.
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