Blueberry Big Devil Auto First Grow!

I have four plants that were planted in soil on 3/21 after germination. This is my first grow so I thought I would just keep it simple in some Foxfarm Ocean Forest Potting Soil, I haven't added any nutrients yet but already have the fox farms trio and some calmag. I am having trouble keeping the humidity up as I live in a pretty dry place, so I ordered a small humidifier in hopes to not have to mist the walls of the tent every few hours. I topped two of the four just to see what kind of differences it would make. If anyone has any suggestions, please feel free to comment! I know there are many other or better ways to grow and am already reading into all of my options, but very open to feedback and help of any kind!