thx for the post just getting back into hydro and didnt remember having to worry about it so much but my ph is rising a fair bit each day (i have 1 plant in the system)I seek a pH of 5.5 to 6.5, 5.8 being the best for me. I TOP OFF my water, daily, and adjsut the pH daily. I drain and replinish at least once a week.
I change my water every two weeks,as Roseman has said,some do it every week.It is up to you and what fits your system best.Small tanks i would change more often.thx for the post just getting back into hydro and didnt remember having to worry about it so much but my ph is rising a fair bit each day (i have 1 plant in the system)