Mario's over the tank river.

This little river will be installed atop my 75 gallon tank.  The river is the same length as the tank; 48 inches.  It is about 5 inches wide and just over 1.5 inches high.  It's not high, it will be low flow river with of course plants in it.  Bed will be lavarock with maybe some pieces  of drift wood.

This is the barebone box without the ends.  Because it's dadoes, just wanted to do a dry fit before glueing the parts together

This is the outflow.  Water will return to the tanks through this small opening.

This is some arrangements in progress.  I seived all the lava rock I have to get some smaller ones.  I am a little short in rocks.  I will throw some larger ones int.  I painted and varnished the outside of the wooden box.  The inside is line with a PVC pond liner.  Then I place a layer of geotextile then the rocks.