should i give her a h2o2 bath then
No, simply dump and refill the res.
Another answer is that you should know that daily rising pH is "normal". You should be checking and adjusting everyday at lights on. To a point......Different nutrients are best available at differing pH values. Attempting to "hold" a single pH value in hydro is a losing proposition on several levels....
#1: You can't - should be understood to start.
#2: Allowing a "swing" in pH value is actually a benefit! Nature does so in soil - "It" gets watered and the pH value of the soil drops by about a whole point....(why 6.5 and 6.7 are the "go-to" set points for soil pH). In hydro. It's given that 5.5 to 6.2 is the
"sweet" spot for hydro. You set the res to your chosen "low" value and allow it to rise to the high (or more over a 24hr period).
Example - direct from old notes: Set pH value to 5.7 - 5.8 and walk away. Next day: pH value rose to 6.4 - Adjusted to 5.7 and done. Next day: pH value rose to 6.3 - Adjusted to 5.7........You get the idea now?
Why do "I" chose to adjust or set to 5.7/5.8? I have found more problems - faster at lower values! With "my" set ups and environmental conditions (water especially), that's what worked the "best" for "me".
If your getting that big a rise, that fast. Lower pH value set point maybe the answer to staying better "in" that "sweet spot" your trying to maintain. Like, going down to that 5.5 low value "limit"...... I would not even try to go lower then that! You'l be loosing too much Ca,Mg and Mo.
I like to say that the best pH range for hydro is between 5.8 and 6.2 - this is the "real" sweet spot, as everything is available in that range...... So set to 5.7 everyday at lights on. In time, the plant and it's pH swing should become less and far more "regular". You simply adjust as needed then..
Lastly. SouthernCross and ANC are
very correct about not using AACT in hydro applications. There are types of beneficial's that will work in hydro. "Zyme" labeled ones are a real good place to start. These will "eat" the shed cellulose from the roots and supply the result to the plant - it keeps the res cleaner and the nutrient in the res, viable longer.
NEVER add Molasses to hydro!
Be not mistaken that you have to dump and refill that res as needed still too! That's another question though eh?