Just ordered a few hundred 1 inch bio filter balls.
http://www.amazon.com/Jardin-Aquariu...N%3DB004V7CXBW
Going to be using them on my smaller system, but was curious if anyone has actually used these things in a larger system? We are in the process of building out a new system with about 600 gallon capacity and I was thinking of running a sand filter to try and break up some of the solid matter...

Any help would be appreciated.