problems with OG Kush clone

this is my first grow. im doing a verticle hydroponic with only the one clone at this moment. If i had more thatn what i have now and they all started looking like this i might have started to shit my pants. i picked the clone up from a dispensary and it looked a little droopy but i got it anyway. it puffed itself back up after i put in the hydroponic solution but i started to notice more defects as the days went on. when i picked the clone up some of the leaves already had a few curled upward tips that were dead. looked like ash and breaks off easily. i dont mess with that much and just leave it be. as of this morning my ph was sitting at 5.8. i have only about 3.5 gallons of water sitting in my res which is enough to cover the water pump. i have a feeling im going to have to add more in the near future since my water level isnt as high as it used to be. i also noticed this afternoon that i started to see brown stripes apearing on my stems. one part of the stem was dark brown but i sprayed pure water on it and the brown slowy faded(might have been my eyes but i came back a few minutes later and it seemed to have faded but the brown stripes where still there. pictues are taken daily to compare but i forgot to take a picture of when i first got the baby. notice the time stamps on the pictures. any and every bit of help would be greatly appreciated.
 

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