Seedling just wont grow at all. Yellow and tiny.

I currently have had 4 Nirvana Blue Mystic Autoflowers going for about 2, going on 3 weeks now, 3 of them are doing spectacular, starting branch out real nice and getting pretty big. One of them has been about the same size for the past week and a half and isnt doing so well, it has started to yellow and droop since it's last watering, no spots or anything, just looks like crap.

It gets about the same amount of light as the others, same soil, just gave them their first watered down 30-10-10 ferts the other day, PH adjusted and everything, pretty sure I dont over water them and I just fixed the soil PH the other day, it was a tad high (7.0-7.2) but I dont think that was that since one of the other healthy plants was about the same.

Is there such a thing as just bad seeds? Should I just germ another seed to replace it or is this problem my fault?

yeah ther are bad seeds....it happens is it bag seed? you should really not give them ferts tho at least the retarded ones

We get runts in the op. I can tell a snip that will runt while its still on the mother. The seed was probably developed on the lower region of the plant or it may have suffered from being mishandled. Any of the what I have mentioned is true providing your other plants are being started and grown all in the same way. If time is not a factor, give it a chance. I usually use fertilizer spikes to start my seedlings in soil. That takes the ? marks out of it for me. Make sure your spike and/or your fertilizer is in the soil before you put them in your pots. Our clones go from the bin, sprayed with clean water and go straight into the op. The op runs fertilizer all the time. Start germinating your seeds approximately 7 days before the full moon.