Seedling in Rock Wool.

I would let it dry more before you change the water. PLants are fine when you have a high or low ph for a constant amount of time but when you dramatically change them it is when things go bad.
Sorry I been blazin across sac, if there's anything I can do to help, like some questions via HYDROPONICS, just ask ma man.

Hey guys what do you make of this wrinkly leaf really bothering me? and the new growth coming outta the top looks kinda wrinkled too but they haven't fully opened up yet but they look wrinkled i had the light up at 2 feet i just dropped it down to a foot above with some fans blowing across the reflector to cool the heat. So i'm just seeing if they were wrinkling cause they needed more light if it doesnt change i will raise it back up a bit. it is on its 3 set of internodes right now. I havent checked the ph in a day. I am just dipping it into a bucket of RO water with a ppm of 200-250 and i checked ppm after dunking it and it was the same so the ph might be starting to level out at 5.5. I am going take Mister Nice Guys advice though and let the cube dry out then see what it is like after. Here's some pic to take a look boys.

I just talked to the hydroshop dude , he says not to firt the first 5-7 days but use a clone/seedling FX spray. Contains micro-nutrients and B1 and other shit to kick start them.