lower fans leaves turning yellow need help

[pushit]

thanks for the advice guys . mattj12pint you said check my ph levels my soil ph is 6.8 is this ok and about the nutes im using boi bizz

I believe he's talking about your ingoing water ph. As long as your ingoing water ph is around 6.5ish youll be fine. If you are adding nutes to your water, make sure you check the ph after its added. Like he said, nutes will usually drop the ph