Well since there's other people poppin these beans, I figured I'd chime in.
Well, I have 8 seedlings right now, and 5 strains in those seedlings. They are about 2 weeks old now. Out of my 8 seedlings, the OG18 is super sensitive to nitrogen. It's first and second leaf sets are clawing a little and I haven't even fed yet. They are just in my seedling mix, it is only peat moss, compost, and worm castings.
With that being said, the OG18 is at least a little more vigorous than the other seedlings, it's pushin out leaf sets pretty quickly still despite the N toxicity.
Tha'ts about all I got for now... lol