I hate to say this man... but, do you have anymore seeds?? At this point and this early on, you've stressed this little plant and I'd worry about hermie issues down the road. I think your tap water may have been the culprit with the PH being so far off. Sometimes we get lucky, sometimes we don't..
I guess it depends on your seed stock man.. but I'd try a restart see if things go much better.. lord knows I've had to do it plenty of times, plenty... lol. It's a learning lesson and we all do it.
Also.. if not PH the only other thing I can think of is a certain nutrient burn... OR, bleaching from lights to close.
As you can see, all the help you need is right here.. just keep your thread going, keep sharing and people will gladly guide you in the right direction. As growers and smokers we want to see everyone succeed..
cheers