help..!!!!!.she's sick

UUUmmmm Hello to all u pot heads...I came across this site while looking for answers to my problem...hope that i can get some insight..to this problem that i am having ...

let's see now..Ummm.. She's about 7 week's old , 30 cm high..(ha..high..lol..)
growing under 600 HPS...which are about 70 cm above her. feeding her just hydro part A & B... room temp is 27 degrees celciouse ..humidity at 45.. she is growing in coco in a buck that is 50 litter's fan are on...ummm...PH is at 6.2...

the problem is that her leaf's manyl the fan leaf's are curling up...i have tried EPSON SALT.... for the past five day's this is not working... PLS HELP!!!

Here's a picture Guide on plant problems Marijuana Plants Problems - Yellow Leaves, brown spots, nutrient shortage etc. and another Marijuana Nutrient Disorders

REPOT. Because with the flushing and stuff you have probably messed with the buffers.

Looks over-watered. Lay off the Epsom salts. Go to horticulture store and get good potting soil with plenty of vermiculite or perlite in it.