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I'm curious about a idea I have. I've never liked the fact that the sand under a rock eventually ends up black due to poor circulation. This in turn causes the water to become foul. I have put rock on the bare bottom and put the sand in afterwards. Sand always ends up under the rock. I have a shallow bed of sand (was a deep bed). My thoughts are to build racks out of 1/2" diameter PVC to raise the rocks off the bottom about 3/4". The sand should be able to cover the piping. This would allow sand sifting critters to actually get under the rocks. What do you guys think?
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