I'm planning four grow beds, 4x8x12"deep, which should equal about 120 gallons of water each, after considering the displacement of the media, which equals 480 gallons for four grow beds, plus a 320 gallon fish tank, which equals 800 gallons total. My understanding from DIY is that a flood and drain four times an hour is good. So, is an 800 gph pump needed, or a 3200 gph pump needed?

I'm planning on only using the type of goldfish that only get around four inchs long, so with a 320 gallon fish tank, will that fish tank be able to support the four grow beds?

If I had a plant every six inches, that would equal 105 plants per bed, and 420 total. So, I need to figure out if ALL these numbers will work together in harmony.

Thanks much.