Tomuk plants are lookin pretty good. I also grow with Canna nutrients and have had very good success in a 4'x5' grow space (that's 1.2 meters by 1.5 meters) Last harvest was 1.3 kilos. Altho I grow with a different style I think you will do pretty good from what I can see. Good job growing with out a ph meter or a TDS meter. IMHO I think you could increase your yield some by PHing once you can afford a meter I have attached a PH chart so you can see the optimum range for ph in hydro as coco is a form of hydro