Redesigned the 5 gallon fish tank filter. The original system used a combination of NaturAire commercial furnace filter material and three types of rock: red lava, pea gravel and lime stone aggregate sandwiched between the filter medium.

After a week of operation, I decided to re-confirgure the system, removing all the stone material.  It their place I created two  sand filters made out of a pair of my wife's old panty hose legs filled with sand. So now the both the grow bed and fish…