Pvc can act as a scaffold. take a masonry bit & drill your live rock & secure it to the pvc construct with zip ties. You can get quite creative & minimize contact with the sand bed, create better flow, minimize "dead-spots" & add tons of caves & crannies for the fishies. Use black expanding pond foam to hide any exposed joints or to help blend structures together, etc. I dry fit the pvc together & drill holes through it so the zips can fit tight.
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