First Grow Auto Blueberry

sinc you are in soil, wait until you see a hint of yellow on the cotyledons, then slowly start to ramp up your fertilization. If you use the same substrate of same proportions, you can pre-empt this timing next time. Take note of when it occurs and start feeding before that point next time. Trial and error.. so many moving parts that make your environment slightly different than another garden.

looks fine.. leaves have consistent color and generally perky. Looks like normal lighting in that picture or a very dimmed grow light? if not and that is under an intense grow light, may want to back off on N or Mg as it's getting dark (plants appear paler than they actually are under intense grow lights) Make sure internodes continue to elongate at least a little bit -- don't want stertchy, but no lengthening is just as bad. When you LST or top, growth hormones spread out -- you may have more growth occurring in total, but in any one spot it may look slower than before. if the plant goes from 1 dominant top to 4-5+, it's going to take a second for the roots to be able to supply that much more growth occuring concurrently. if your were counting total new nodes per week.. you may see fewer new nodes at one one palce but should add up to more new nodes relative to expected uptick over time as growth rate is increasing upto any phyiscal limitations (pot size, et al and genetics will limit how big a plant grows and growth will slow back down again when you approach that limit, but early on it's incerasing exponentially. plant doubles every 7-10 days or so.) 2 to 4, would be +2 then 4 to 8 was be +4, then +8, +16 etc... whatever the time to double ends up being in your garden. some methods cause faster growth than others. soilless/hydro generally is the most productive way.