help with bontanicare nutes////ph NOT A NEWBIE QUESTION permalink

help with bontanicare nutes////ph NOT A NEWBIE QUESTION
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very experienced grower i know switched nutes from a chemical base to bontanicare problend grow and liquid karma ....will be using cal mag aquashield and silcia blast ...but currently babies to young anyway grower can not get ph to stabilize 55 gal rez does anyone have any ph problems with these nutes or any suggestions for this problem plants look good but ph goes from 5.8 to 7.3 overnight never had this problem with other nutes starting to wonder if organic is the way to go so any advice from experienced growers is always appreciated does anyone think the ph problem will go away when he starts using full recipie? btw the rez is on chiller and only other question i have is at night the rez temp dropped from 69f to 62f could that effect ph?
 
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