well...are you only growing in a 1.5' tall space or do you have more space to work with? 12/12 from seed is notorious for dwarfy small plants...1/2-1oz/plant when done even correctly as the plant didn't get any time to make a good root system and pathways for nutrients to flow nicely. Even giving it a few weeks of "veg" you'll get much more out of a plant. thats my opinion on the subject