Saying 'no THC' is kinda odd. I think what you mean is no visible trichomes. I've seen that on lines with very weak genetics... the plants that after they finish get tossed in my hash scraps pile. Some strains don't really get a frosty appearance. They can still mess you up but good though. Wait until you get the smoke test done to say it was a failure.
Your soil looks soggy btw... I think you don't have enough drainage.