Your plants don't look to be in too bad of shape (at least not the one) so don't panic, you have some time to pull them through. I agree with THG that you are in the wrong soil and that is causing elemental problems. I also noticed that the soil looks to be fairly dense. If that is the case, it will become very difficult to get water through to the rootball and that is a whole new problem. If your water drains well, and I mean water runoff out the bottom within 1 minute max, then you can use that soil if money is tight and you have already spent on it.
But what you will have to do is "flush the soil in the plants and all that you intend to use. This will remove the elements from the soil. I use a door screen on buckets to flush medium that isn't in pots. The grass thanks me for it every time. This will be time consuming and water consuming so the decision is yours.
But you need to get some MJ specific nutrients, not "fertilizer" as they don't make "fertilizer" for growing MJ, they are generic for house plant use. MJ is VERY need specific and is a very high energy plant that is unlike anything else in the garden or house. You need to look for specialized nutrients for MJ. Not sure where you are but if you can't get to a "hydro store" in your area(like me), you can order it off Amazon.