Whats up?
388 is on the high side for tap water but it should be ok. I use 350ish tap water for my seedlings. If I were have to guess it was probably the very low PH. Distilled water lacks minerals and such that the plants need. Its good if you supplement those minerals but tap water makes it much easier because all that shiz is already there.
Maybe you have reallly bad chlorine levels but it was probably the PH...

Just my 2 cents.
GetThisOrDie Reviewed by GetThisOrDie on . Brown leaves on seedlings. HELP Guys: Need some help with what's going on with my 2 week old seedlings. Just in a couple of days the leaves started getting brown. Up to just few days ago had been using distilled water now have 5.5 PH tap water going and they are in rapid rooter cubes under florescent lights Ideas of what is going on and how to fix?? :( Help appreciated :) Rating: 5