Jelly Donutz - Why not?

All 3 seeds germinated and popped on the second day in a glass of water. i planted the pops in rockwool saturated with water and let them dry overnight and kept damp, Day 4 saw the first 2 plants with green crowns showing, while 3rd sprout was no show. Day 6 we had a straw on the bottom of the 2 seedlings and placed them into buckets on Day 7. Tent conditions are 35% humidity with daytime highs of 80 with lows at 72; water temp is 66-69 f and keeping both PHs between 5.6 -5.8 area. Lights on 20/4 at this point, these things should take off like a rocket over the next week.