I've been battling with a pH problem. pH rose from 6.5 to 9.5 over the week so I've started monitoring it. At the next res change I'll pH to 5 to compensate for the rise and monitor accordingly. It's my first shot at hydro so I'll probably be using this grow to dial things in as I have a couple extra grows starting soon too.
change ur water every 72 hours...................................its almost not possible to have ph raise to 9.5 without killing this little thing...........................and by my book its way too early for hydroton