they are growing in my closet with a 12in fan next to them and i try to keep fresh air in the room the closet is in with a bigger fan and opening a window often

im using 'Expert gardener'' potting mix and ''miracle grow'' indoor plant food spikes and watering with tap water till they drain a little every other day or so

ive tried to FIM one and top one of the others

ive pinched a couple of the others stems as well

is it too early to train or prune them?
are their nodes too stretched?
is a leaf or two wrinkling a bit a bad sign?
what is something i can do to make my grow better with respect to the fact that im pretty much broke?