Hi, after playing around with a small system I decided to go bigger and build a new one using CHOP 2, here's what it looks like so far

http://cl.ly/image/113Z3e401T1K
http://cl.ly/image/3r1P0Q3s3k27

Top tank is ~100 Gallons and bottom is ~50, with tilapia on the top and crayfish on the bottom. I got the flow for the grow beds right so the syphon works as intended, but after doing that, there's just a tiny flow of water to the main tank and so no way that water is getting cycled once per hour. The pump is suposed to give me over 200gph at 4' (so the guy at SD Hydroponics said).

Was I suposed to use a bigger pump? or is the way the pipes are organized affecting it, saw some drawings and they went to ground level then up, I did grow bed level and then up a bit for the tank.