A donor, ?

You mean a mother plant? Is it going to be used for clones..?

I am starting to think hat the leaves on the bottom are turniing yellow because they are not getting enough light... very very common

Is your plant Spindly?

I would not break up the soil with a fork..for that to be effective you would have to go deep enough that it woould also damage the roots..

If it is something you really want to take care of.. you should transplant.. using a 80-20 - soil/perlite mixture..

ya feel me..

: )