Hi all,

Am new here.

I recently started volunteering at a urban gardening center that has an aquaponics system that seems to be copied from Will Allen's Growing Power.

The growing beds seem to be sloped about 1 inch per six feet.  My thought is that beds are usually flat.  In building new beds, should they be level or sloped?

Also the media is about 6 inches deep, as opposed to 12 inches recommended in the book.  How much less effective will 6 inch…