This started about a week ago. The leaves on bottome turn yellow at the tips and then the yellowing slowly spreads inwards. The plant is just over 4 weeks it's under a T5 fixtures. It's in a waterfarm that had superthrive and ½ strength growbig and big bloom. As of about 15 minutes ago it's on just water. This is my only plant right now, please tell me how to make it not dead.

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i have a question what is that soil type of rock looking thing that your using?? your baby looks amazing ^_^

It looks like over-watering. How often are you watering it?

Hydroton, I think they're clay balls.

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I have a timer set to 1 hr on 1 hr off for as long as the lights are on. So the lights are on 18 hrs and the water is going for 9 hrs a day.

Over watering turns leaves yellow?

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I wish I could tell you bud, I am using a hydro setup also but a different style I believe. Are you drip feeding, misting or flooding in your setup? I ask because of the ring around the plant in the pic. In general I am reading about flood cycles with hydroton (clay pellets) lasting in the few minute range. anywhere from 5 to 15. I was flooding for half an hour recently until I read that after pushing 30% more water / nutes through your grow area than it holds is enough. Now I am watering every 3 hours for 10 minutes vs 1/2 hour during every 2 hour period. Sounds to me like you are watering a lot. I have checked down into my clay pellets with the new shorter flood cycle with more time between floods and the pellets are staying moist / wet. Hopefully this helps a bit!

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might be lack of nutrients