How about some photos and fill out the troubleshooting sticky at the top of the plant problems section?

And off the top....try watering twice a day like you did by hand and see if it makes a difference.

Ps....they're not in a hydrohut are they?
Weedhound Reviewed by Weedhound on . Ebb and flow problem...why are my plants turning yellow? (merged) Can any one answer this...it seems pretty simple but cant seem to get anything in plant problems to match ...i keep having a problem when i switch from one growth stage to the next ...i had ak47 and burmese kush plants in 4x4x4 rock wool cubes which i watered daily by hand with a basic flora nova grow and hygrozyme nutriernt mix the plants flourished ..i did this for almost 7 weeks and was able to sex out the true males...i then took my remaining females and put those into a 4'x4' ebb and flow Rating: 5