I used HID for veg for my first grow (2 plants, didn't top them at all), but now that I'll be doing SoG, I decided to get a 75x75cm hydro tub, I use pretty standard hydro nutes btw. How many plants would 75x75 allow me to do a real SoG in, its like 2.5 ft by 2.5, so would it be 5 total plants...