Stems becoming red. I didn't use any nutrients yet. Should I add a little bit of them to water? Water pH is about 6.5. Do the leaves look ok?

If your using BioBizz nutrients I would suggest referencing the feeding schedule. its located below: https://www.biobizz.com/wp-content/uploads/2020/03/Nutrient-Schedule-EN-2020.pdf growing in soil and perlite is a good option, its hard to say what nutrients that soil has in it already without a brand name attached to it. It would be a safe bet to give it a bit of feed. please remember that autos do not feed as heavy as photoperiod plants and this will need to be adjusted a bit. a weblink to a good reference will be posted below to find the optimal EC/PPM for feeding autos and their life stages. Here's a snip-it for your stage. clones / seeds - week 1 - 140ppm / 0.2 ec week 2 - 210ppm / 0.3 ec With that said. Its best to grow autos in their forever pot and avoid transplanting them at all cost, they can be tricky and get a little weird about it. Sometimes entering flower early or being very stunted in growth. As long as your super careful and don't hurt the root ball you should be fine. Just avoid it in the future. I have grown Fast Eddy by RQS before. It was my first ever outdoor grow and before I knew of Growdiaries. They are a good plant and can take some abuse I found. they also have a very fragrant skunk smell when they really get into there flowing period. Your initial instinct of giving them some feed is correct. If you do not have a PPM/EC pen, use 1/4 the strength recommended by BioBizz and try and pick one up on your day to day in the next week or two. Autofeeding chart weblink. https://www.autoflower.net/forums/threads/med-man-method-feeding-chart-ppm-ec.47856/ Best Of Luck and Happy Growing!