Seedling needs help

Hey buddy. If ur soil is pre loaded then you won't need much in the way of nutes for 2-4 wks. If not, you should be introducing some sort of nutes even at 1/3 strength, does a young plant need them, no not much, will they help, of course they will. It 12 days old and I'm sure if she was started on nutes after wk1 u wouldn't be seeing that and your plant would be 1/2 if not a 1/3 bigger. 2-400ppm is enough and raise it 1-200 a wk as you see fit. Focus on core NPK for growth 5-1-3 NPK ratio is fine for growth. As she moves into stigma you wanna start pushing higher doses of PK, and switch to bloom and when she is moving into pre-flowering autos need micro nutes more so than photos because of the ruderails. Good luck buddy

Needs dry soil when you water try doing it in halfs. Only when dry in soil you need wet, and dry times. So you have to cycle. You don't need to water base of plant to water it. I would let it dry out first and then consider nutrition. Soil can last 2 to 4 weeks to start without any assistance in most cases. Using a lower ph water will help also bringing the ph in range.