For seedlings, clones, or newly transplanted seedlings, I go 24/0. Then as they're root structure begins introduce the 18/6 for about 4-6 weeks or whatever your plan may be, at this point you should have 4-8 nodes and ready for flower cycle 12/12. Drainage is a must, and overwatering is not good at all. Wait until 3-4 days, I go by the weight of the pot, when its really light its time to water. OR you can do the finger in the soil test, 2 inches deep if soil is dry, its time to water.... Pictures are always helpful for best advice/help feedback.