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Substrate terracing

I wish to terrace substrate in a 55 gallon tank  from a 5 inch height in 
some areas  down to 3 inches or less.  My understanding is that terracing is 
usuually accomplished with rocks and driftwood.  I have read about using 
under gravel plexiglass to prevent leveling from the movement of water and 
fish.  I also plan an under substrate heater.  Are there other methods? 
 What are the tricks to accomplish this with plexiglass when ther is a 
heater?   Any advice pro or con would be appreciated.

Arthur St. Andre
acs2 at mhg_edu