Drainage....

My normal approach with drainage layers in wooden vivs is to build an acrylic/glass tray to sit in the bottom of the viv, I normally build it in situ so the sizes are axact. Then you can either leave a syphon hanging out or drill a drain hole in the bottom and put drainage piping through this.
Once the acrylic/glass tray is in place you can either put a false floor of egg crate or similar above it to leave a drainage layer, or fill the bottom with hydroleca. Then you want a semi-permeable membrane, with your chosen substrate on top of this.

Hope this helps,

Dave
 
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