the big ones look good, loose soil is a good thing but ur going to need a 3-5 gal section for roots and soil, and then probably the same for the res. but that set up should last atleast 2 weeks with out topping the res. Very goood find that thing looks perfect in size for a full grow, if you dont want you roots to grow so much out then into a ball i would suggest using smaller pots at first and then when they get too big transplant them and u have a nice root ball already.