Please HELP..Leaves problems

I transplanted my middle plant from a orange 8in pot to a grey 15in pot and soon after that, the leaves started turning brown and curling up, really lookin sick. I took off all the leavef that really looked sick. all of the rally big fan leaves where the first to go... I don't know what is goin on. I've been on here lookin at other folks problems that where like mine and have seen many diiffrent problems. I dont know where to find ph up/down. The only stuff I sen was for pools, but I aint messin with that stuff. So if anyone knows what might be causing this let me know please.. I tried to post a pic of the leaves but it wont let me.... ??????????

You can use the stuff for pools, as long as it's "phosphate free". Or, you can use baking soda(PH up) and vinegar(PH down) to adust your PH. I'm guessing that it's a PH problem, or some problem with the soil you transplanted to.

I transplanted using the same soil as my other too and they are doing fine.. I dont know why its just that one. The lights arent close. They are like 4-5 inches away from touching.. My other two are bout 13-14.5 inches tall and about the same wide.. I was thinking about flowering them but I want to get a nice yield. I hope I get a nice one... Im lookin forward to at least two females..