your watering it too much....decrease the amount you water the plant....i had the prob cuz i did it on a daily basis...so dont water as often...let the top of the soil get real dry before the next watering...but dont be shy to mist the top once a day lightly.
if you want good airation in soil try using earthworms...i know it sounds somewhat odd but read up on them...they are extremely beneficial to soil and improve drainage/airation. it works for me
well milk is near neutral on the ph scale...and i mean im not sure it will harm it...theres some calcium in there some other fancy things lol...just do a flush you should be ok
well you could do water for a while depdending on your grow medium. but you can get plant food that is water disovable and just follow directions and you should do quite well