I think there is cheaper "reticulated foam" than poret brand? I was told I could get generic cheaper but had already bought a bunch of sheets of the 4" thick various ppi density from poret. May be worth looking into as Swiss tropicals (main source) isn't exactly cheap. Then I cut oversized on the ban saw a large circular cutout, stuff her in the 55 gallon barrel very snug, and it's a layer of mechanical and biological in the barrel. Cut it to fit whatever application you need.




