Hi,

That is a very nice size area to use for a commercial system, it's hard to tell the grade of the land from the pic.......
Depending on what all you are wanting to do, I would landscape it so that you have terrace's at different levels, so that the water will flow down hill from the fish tanks, through your grow beds or what ever you are using, to a lowest point sump tank, and then pump the water back up to the fish tank. Doing the same thing as almost everyone here, just on a very much larger scale.

I would also set up several different FT's, GB's, ST's, strings, vs one large one, so that you can do different things in them and if one crashes for some reason, it's not the entire system going down........

RS