Water till a little drain off is achieved (water....wait.....water....should be good) then you know soil is soaked and ALWAYS let it dry completely... if using coco/cocoblend the soil may even crack... perfect water till runoff again. Watch out for over watering and I suggest learning dry weight vs wet weight (by feel).... then you always know how dry they are for sure. Small cab for anything but a 12/12 from seed cola.... BUT check out Luigi's thread, amazing results with small space!