you might consider starting over when you have the set-up fixed. that plant is so stunted and it looks kinda yellow as well. in my experience if a plant is stressed alot early in life, then it never does well in flower. it will be much more likely to hermie. don't use the mg. just wait till you get the ff stuff. i used ff big bloom, tiger bloom, grow big along with liquid karma and thrive alive green. be very careful with the ff ferts. they are very acidic and you will need to adjust the ph to 6.2-6.4 with ph up before feeding the plants otherwise they will just end up locking up on you. also when mixing the soil try to use something like promix or sunshine mix and mix as follows:

2 gallons soil
1 to 1 1/2 gallons perlite (airation and drainage)
3-5 tbsp dolimite lime(keeps ph stable)

you should also try to build a cool tube for the mh to use for veg and if possible get a hps as it is much better for flowering.

a fan in the closet is circulation not ventillation. circulation is important as well but you must get rid of the hot air, the fan just blows it around. you will have to get a prety powerfull exhaust fan(daytons are great) and install it at the top of the closet so it blows the air out through a hole in the wall or ceiling. you will need a carbon scrubber attached to the exhaust as well to control odor. for intake you must cut holes at the bottom of the closet and if possible have an intake fan. remember all this MUST BE LIGHTPROOF. meaning that when the lights are off the plant is in COMPLETE DARKNESS with NO INTERUPTIONS. if there are lightleaks or interuptions in the dark period the plant will hermie, take a super long time to flower and or possibly even revert back to veg.

here is a link to a place that has daytons pretty reasonably priced:
http://www.living-learning.com/fans/fans.htm

good luck and if you have anymore ?'s just ask.