Needsss help now!

My two plants are 3 and half weeks into growing and they both look very good except I am concerend about one. Within the last day one of the pair of leaves on one plant has begin to droop and its it has become brown and almost looks dead. I need help with it and any suggestions will help.

Thanx
Newbiegrower12

as long as it doesnt cause any more problems or show other symptoms I would just cut it off....but what part of the plant is it and how big is it? and what is the PH?

Well its two pairs of three leaves each and I'm pretty concerned right not cause they both look dead. The whole plant is starting to look bad right now and i really do not know whats wrong with it. My PH is alittle under 7 and it is on a 24/0 light cycle. If you or anyone could help me out I'd greatly appreciate it.

Thanx
Newbiegrower12

Try switching your lights to 18/6 insted of 24/0.

do u have enough soil??
i did have brown leave
dieng
and it was all relate to root bound
not enough soil for the roots
good luck