What kind of ph tester are you using. Is it freshly calibrated?

I agree with Revanche that you may not have enough root mass in the water to keep the plant happy

My very first guess....ph is off somewhere. Second guess......some sort of damage/disease to the roots but that's about all I can think of.
Weedhound Reviewed by Weedhound on . DWC momma is not happy!! :( Hi everyone, The momma is having a great deal of issues right now and I'm not sure why! :( Setup -- DWC - 5 gallon tank Two air stones water level half way up at pot... about 20% of roots in water.. inside water temp 72* -- it's as low as I can get it. Rating: 5