hmmmm, i'm not sure what that could be...... i can give you some of my opinions and you see if it feels like it may be something you might try. i personally don't like my water at 80 degrees.... wait is your room 80 or water 80? water should be between 72-75 degrees is what i think is best and room temp is fine if between 70-80 during the day.

OH! make sure that NO light is getting into your water basin! if there is ANY light getting in there, you can get an algae buildup and that can mess with your PH very easily.
kuri Reviewed by kuri on . PH UNSTABLE Seems that this ph problem is killing me,using a emily's garden with a 400 hps light,temp=80 degrees farh.Soaked medium for 48 hrs in ph balanced water,but still rises 2pts in24 hrs.I do not even have plants in system.I was trying to get ph stable b4 dropping in plants...what could be the cause? everything points to medium..did I not soiak the long enough?..This is 1st hydro grow,normally I grow in soil without problems..any help would be appreciated..thnx guys/gals Rating: 5