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Also, with a false-bottom tank, gravel is not nessesary. It "can" go water--> PVC support --> false bottom --> screen (not metal) --> substrate (ie. coco fiber covered with moss and/or leaves).
The false-bottom replaces the gravel (I think that is what's shown in your diagram)
The false-bottom replaces the gravel (I think that is what's shown in your diagram)