The tank has a 4" DSB in the display. To maximize the sand in the tank while ensuring good water flow and detritivore movement, I raised the rock off the tank bottom using PVC pipe. This was a quick and easy way, but was very effective.
It's basically 5" diameter PVC cut into apq. 5" sections. I drilled the main holes with a hole saw and then used a dremmel to shape the support. The patterns are somewhat random which allowed me to match the support with a rock.
These pictures are not of my final aquascape. I had an incident where I had to retrieve a dead fish that forced me to remove a significant portion of the rock work. I never did find the fish and almost suffered a full tank crash as a result, but when I refit the rocks the new structure was better than the old.
<All of the images are clickable if you want to see it in high"er" res>
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