First time grower First time problems, whats wrong with my plants!

Hey all, first i would like to thank each and everyone of you individually for looking at my post... But, since that will take too long I will say Thank You all in advance.
I have started to have problems with my 5 week old vegging GDP Plant the a few leaves are starting to Turn yellowish and starting to Curl. I use a PH test kit and it was way off for a day or 2 it was around 7.0 Lowered it back to 5.4 woke up and it was off again but not by much. It is in a 10 Gallon res with 2 other plants DWC with a ultrasonic fogger airstone and top feeding I am using Great White, Hygrozyme, General hydro Flora, Cal Mag and B52. i thought it was nute burn so i flipped it over to transition at half strength. They are under a 400 watt Metal Hallide and were at 5 inches until i raised them yesterday to about 16 inches. Also once i get this sorted out should i clip the leaves or leave them.
Thank You All So Much Once Again.

nutrient burn

Should i do a flush with Just r/o and great white for a day or is using half strength of the transition period of flora a reasonable solution?

Looks like some sort of burn, sure clip the damaged parts.

Cooltube, I don't think distance matters, but what do I know.

From what I see, the damage is minor and localized and you've taken action. I wouldn't be worried.

Your's look better than mine +rep.

Have fun

The tips do show signs of nutes being too high but the really bad spot looks more like something splashed on it.

superstoner1 said:

The tips do show signs of nutes being too high but the really bad spot looks more like something splashed on it.

Click to expand...

What he said

Thank You all. Happy Farming.

superstoner1 said:

The tips do show signs of nutes being too high but the really bad spot looks more like something splashed on it.

Click to expand...

That's the first thing that I thought too. Along with tho close to the light. You can burn them with light.