growing setup

I have made a floating grow system.  It is a 2'x4'x2" sheet of insulation foam.  I went to a local Hydroponics store and bought some mesh pots for it.  Being the first time I have tried  this setup I am not sure about the spacing of the pots or the size  that is best to use.  I have 15  three inch pots, 5 four inch pots, and 3 five inch pots. I filled the pots with washed pea gravel.  So far I have planted chard, spinach, basil, brockaly, and chives in the floating system.  I planted watercress in the top of my bio filter where it is doing very well even with so few fish in the system.   I also made a grow tub out of a cement mixing tub from the hardware store.  I filled it with pea gravel and put a timed pump on it so that the water would rise and fall in the tub to let air down to the roots of the plants growing there.  I am going to try tomatoes also but I don't know how well they will do in the system.  I am starting out with mostly green leafy plants because I have a green house over this whole setup and it will keep out most of the polinators that would be needed for flowering plants. I will try to hand polinate but I dont know how well that will work.