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Roger Miller writes:
> Can anyone here give me ideas on how to build terraces or other sorts of
> relief into a substrate so that it both looks natural and stays in place?
I have done it only once. I found a 5-lb bag of polished river rock in the
fish dept. at Wally World. They were pieces of different-colored,
quartz-like stuff about 1 1/2 inches in size. I stacked them where I wanted
the edge of the terraces, and glued them together with silicone. It held up
until I moved the tank about a year-and-a-half later. Pieces of small
driftwood branches might also be effective.