Maybe if they are very small strains, but plants like to grow big in earth boxes, especially with good soil. I would recommend no more than two plants.
If I were to grow multi-plants in a Regular EB, it would be only two SMALL girls placed on the ends. ........obviously to fit, but mainly because the wicking sections are on the ends.
But how far apart do they suggest spacing those pots? Most I've seen is 2' apart. Then how are you gonna grow? If you're thinking living soil, most folks recommend a 10-15 gal pot.
I think any more than two, they'd fight over the water, with the outer two getting the lion share. I think the outer two would overshadow the other two by the beginning of flower. I think the end plants will establish their roots in the wicking area naturally first and prevent, for the most part, the inner two from establishing roots in that area.
Do ya have other pots/bags? If ya do and have the room, just move them. I'd let them develop a bit to get some roots under them. Have your other pots ready with holes and some mycos sprinkled in the hole or watered in if you have soluble mycos. Water the area around the seedling to help bind the media, Just place each hand a few inches either side of the seedling, bury our fingers up to your knuckles at an angle, squish the media together a bit and pick it up and place in the new pot. Slightly pack it down to get good contact.
