This is a 5 week old Mistery seed (haha that i took from one of my weed bags), She started to get yellow and the growing got slower, please help me to figure it out what´s happening
Looks to me like it could be transplanted. Number one sign is the purple stems, then the yellowing leaves (don't quote me on that, just my opinion). You could replant it into the same size pot, just with new soil. Check this out, Bonsai Mothers - 420 Magazine™ or just put it in a bigger pot
soil 30%vermiuclite ,30%perlite and 60% humus, nutes hi nitri 20-10-20 and CalMag15-05-15, lights HPS 150w 24h on, , temps 30º+