Age of the plant and the strain? You say a full strength feed - have you fed them before and if so what was the strength of those feeds? What medium are the growing in?
I kinda lost track of time. But it was put to germ on the 7th of October. I'd say 3-4 days later it sprouted.
Medium is 100% perlite hempy bucket. The seed themselves were put in a small rockwool cube and later went into 10cmx10cm rockwool cubes. The total volume of the buckets is 4.5L (about a gallon)
GH 3 part nutrient 0.7 ml per liter of each Micro Gro and Bloom (this is "full veg nutes" according to the schedule). I never felt the need for a EC meter so I don't have one <-- I follow the schedule on the bottles
Base water is 84 ppm.
I've fed them before starting at equal parts 0.2 ml/liter, then 0.5ml/liter and once 0.7 ml/liter and after the second one this happened.
Today I flushed with 0.5ml/liter equal parts solution at 5.9 ph
Might I mention they've been raised up to this point under Bridgelux Vero 18 80 CRI 4000K and have received their second full veg feeding on their first day under HID/MH. I noticed the deformity today on the second day
Hope it helps