need help guys! one of the leaves is withering

...your probably overwatering.

 

yeah, it should if that is the issue....small plants can be tricky to water in larger pots, they're easily overwatered because the top of the soil will be dry while the bottom is soaked since the root system is young...I start mine in very small pots and transplant into larger pots as they grow....

 

...awe, yeah that's the deal then. You should make sure the soil is near dry before you water again...the roots need oxygen just as much as it needs water.
...one thing to drill into your head as a novice, "A neglected plant will outperform a plant that has recieved too much of anything."

 

...man, relax....it will take several days to recover.

 

you need to learn the "lift method"...fill a similar sized pot with DRY soil...then, pick it up....that's your dry weight.... Do not rewater the soil until the pot is near the same weight as the dry pot.....if it's dry, then water.....

 

You need to relax man. You have a long road ahead of you. It just takes time..

 

...I know what your going through, we've all been there (well, most of us )
...the next time you start a seed, start it in a 1"x1" to start off....around 2 week, transplant it into, say a 4"x4".....after a couple weeks, put'er in a 1 liter pot.....the root system will be less likely to get drowned this way....and, you can bury the stem deeper due to any stretch that may occur....AND, each transplant will work similar to a fertilizing. You can do the whole grow with water only by simply transplanting every 3/4 weeks into quality ORGANIC soil, such as: Fox Farm's Ocean Forest, Roots Organics, exc....

...one way to look at it is, you haven't made any mistakes this far into your growing career....you just learned how NOT to water.

...good luck, and happy growin!

...btw, you haven't fertilized them yet have you? ....what kind of soil and light are you using?

 

...I'd toss the incandescent and get more fluors for the veg....when the time comes get a HID for flowering.