Nice job...cant wait to see em flowering under those cfl's.I just transplanted a clone that had been in a 6.5" pot (about .7 gallon) about 40 days and it was slap full of roots,you might need a transplant.You could probably ease one out of the pot far enough to get a good look,wait till your soil is just slightly damp.As far as nutrients,I started off buying 3 qaurts of the fox farm grow big,big bloom and tiger bloom for rough;ly $20 each which will take a long time to use and will probably start losing its potency long before I can use it up.I have since found a few a few guys on e bay that break the fox farm nutes as well,as a few other popular brands,into 2/4/8 ounce sizes that are really affordable.You can get 4 oz of the f farm trio I mentioned for around $13.Hope this helps...