Droopy and pale Stem & Leaves

My seedling has been doing alright.

This morning, I have checked that the stem got leggy, pale and leaves were droopy..
The color was light greenish too..

So, I repot her more deeply and gave her 50ml of water
because she was almost falling down by blowing fan....

I don't think it's overwatering. surface and coco was quite dried out.
Is this could be a symptom of underwatering?
or is this a damping-off?..
Please help..I am really depressed and worried..

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Genetics: Hericules from Sannie's shop, Netherland (Indica)
Lights: 45W Flourescent 'white' x2 (Running 24/0)
RH: 60~70% (Humidifier inside tent)
Temp: 77~80 F (120mm PC Fan x3 blowing)
Medium: GH Coco Coir/Perlite (60/40)
Water PH: 5.9~6.1 (No nutes)

It looks just fine, most likely it just needed a drink of water. Since it is spindly, point the fan away from it some to give it enough movement without blowing it over. That will help strengthen the stem quite considerably. Other than that just be patient, I promise it looks pretty darn good. Patience is the key

P.S. Next time post in the Newbie section for quicker responses.

lol wheres the problem?