Don't worry about stress from underwatering. Overwatering puts 10x more stress on a plant than under watering. Just slowly pour maybe a 1/4 cup(measurement) per plant right directly around the stem in the middle. When people go by the "water out drainage holes" for watering, that leads to overwatering. Just wait for the leaves to hang down and give them some water. If they seem to droop a lot, don't worry, it's alright. Just make sure the pot is light as can be and dry before giving them water. Like I said, Over-w is worse way than Under-water'n. Jorge's videos can be helpful at times, but can also cause problems like they did for watering. For flowering, Id switch to 12/12 when they all are around a foot anda half. G'day