I don't think you should feed them anything
I think you should ph the water - ALWAYS
DO YOU HAVE rockwool cubes?
You need to learn how to clone.. it is actually really easy.. You will need a single 43 watt bulb and about 12 rockwool cubes... YOu want to make sure you get at least 4 female clones for your next grow... I can almost promise you that THE big plant yo have is female... the nodes look very tights...
So you need
rockwool cubes
razor blades
CFL light
tray to put clones in
cloning gel
wilt spray
find a clone tutorial on the net
don't worry about cutting the clones under water or misting them or any of that shit...
just learn about cutting the clone
where to cut it... how many nodes it should BE/HAVE, cut at an angle etc...
THESE ARE THE TWO or 3 MOST IMPORTANT PARTS to cloining
THE CLONING GEL, the rockwool , the light and the wilt spray will do the rest...
iloveyou
don't worry.. everybody is freaked out the first time they clone... it is normal.. you will do great!!!