Context:
Currently in week 9 after germination, at about day 60. Plant is the ILGM Blue Dream Autoflower. Well into flowering stage. Plant is in a 5 gallon DWC bucket that is topped off with 3 gallons of RO water daily. Right now we are adding about 1 - 1.25 gallons of RO water a day to top off
Problem:
PH is dropping about halfway into the week — after the weekly reservoir and nutrients change
What I tried to do:
I thought that salts might be building up in the water so once the PH starts dropping (about 3 - 4 days since last reservoir and nutrients change) I do a full water change and that stops the PH from dropping.
My Question:
Should I add nutrients to the reservoir after this mid week full reservoir water change? Or should I wait until 7 days since the last nutrients change to add the next weeks does of nutrients