Hi everyone ! i have some trouble with pH stabilit...

I wouldn’t recommend using bleach or peroxide unless after a grow. If you’re cleaning the tank between grows, spray it with hot water and wipe it dry with microfiber - Which can actually pick up bacteria. During your grow, just add positive bacteria or enzymes. You can try Hydroguard, Hygrozyme, Voodoo juice, Sensizyme... add something like that. Unless you’re doing a periodic, post-harvest clean - peroxide is probably overboard IMO. Also, like Athos mentioned, you should expect to see pH drift with nutrient use. It will happen mostly during first few days of nutrient change, and gets steadier over time. Ions, both positive and negative, are being removed from the solution. Just keep your eye on it, calibrate your pH pen every 2-3 weeks max, and you’ll be good. Let us know if anything else pops up!