if you stared in rw stay in it,trying to remove those fragile roots is with out a doubt going to kill yo shit.only you can figure out what your tap water ph is and what it contains. never start a grow unless you have exactly what your plants need to survive. using inferior crap is like a child growing up in a closet with out light and expecting them to function normally when released into society,its just not gonna happen.finish the construction,read then read some more,then read a little more , last but not least get proper equipment, then enjoy the world of trial and error and being pissed that you destroyed yet another crop,and then finally one day you will be growing the sweetest shit around.