I hate to break it to ya but that pot is not going to be good for much besides novelty. Unless you want to grow cannabis' very close cousin, the strawberry! That is what those pots are built for. The side things are supposed to be for the little runner things that you can pin down and root.

I'd suggest you start over with fresh seeds, or try to scoop out as much of each plant's roots as possible- right away- and put each in its own pot. Keep them out of direct sunlight for a few days after transplant to get over having their roots jostled.