hydro problem droopy leaves after PH adjustment

I just posted on here 2 days ago with a problem that occured on 2 of my plants. (Little spots). I was told to adjust the PH (It was at that time around 7.5-. Keep in mind they were growing a month in 7.5-8 ph.

So I adjusted my PH to the recommended 5.0 or so area.. I checked it the next day and it was around 6.5. Re adjusted it to 5.0 and just tested again its around 6.0.

Im guessing the runoff from the rockwool changed the PH..


But whats with these droopy leaves? Only 2 plants (Not the two that had previous problems) are wilting significantly.

400w
6 plants
ebb and flow
2x daily watering
recommended nutrition by Aqua flakes A&B
71-85 temps

(Its the 2 closest ones on the right side).

http://imageshack.us/photo/my-images/841/hihi024.jpg/

Probably a little shock from the rapid change. It has to adjust internally and begin absorbing nutrients a little differently.

For hydro I shoot for 5.8~
Did you pre-soak your rock wool?
This could be reason it keep rinse

hey.. Nope I didn't presoak the rockwool.

But I think the reason it went up so much was because the rockwool was previously wet with water of PH 8.0 or so. (I keep saying 'or so' etc because Im using the liquid color testor.. so I don't get an exact number reading). Im probably going to change the reservoir and put all fresh water/ ph/ nutrients and see how it goes