leaves browning someone please help

I've got 4 master kush plants growing 4 weeks into veg currently under 400 watt MH.. I've been keeping lights atleast 16 inches away at all times and onyl one plant has this burn.. i cant figure out what it is

many pictures are included.. any comments on how the other plants look would be appreciated as well

thanks

a couple more pics

have you been feeding them? the tips of the new leaves look white.

feeding them with foxfarm complete line.. ive been using half recommended dose.. should I use more?

it is starting to get worse...

im thinking maybe its cause i need to repot them.. and my soil hasnt came yet

any other ideas?

Ralphie said:

a couple more pics

Click to expand...

firstly they don't need repotting yet, a few days maybe, and the burning looks like water on the leaves and burning from the 400w MH. SO no worries just hope it don't get worse, otherwise plants lookin nice and nice choice M/kush

thanks for the fast reply.. i was thinking it may have been water on the leaves too.. but just wanted to make sure.. how about those little whiteish spots lower down on the same plant?

i just find it odd that only that one was burnt.. unless it was by water which makes sense

right now the light is about 42 inches away.. however they are in a tent with all reflective material.. and i cant lower it due to the cooling system being up there

heres a pic with the lower whiting leaves

Ralphie said:

feeding them with foxfarm complete line.. ive been using half recommended dose.. should I use more?

Click to expand...

No

Thats most likely why then. stop feeding them nutes, the soil will have every thing the plant needs, just give them ph`ed water. Likes been said wait a few days to a week Repot them and give them about 2 weeks before you start to feed again.

If you repot 2 -4 times before you flower you should never need to use any Nutes in veg... just Free tap water

thanks for the reponse.. for the past 2 days ive been giving them 6.7 phd water