i'm pretty sure @InTheShed runs promix without bothering to ph.
i ph'd at 6.3 when i last ran promix. the formula has changed since then. it's got dolomite to balance ph now.
hp itself notes the media should self balance between 5.9 and 6.2, but won't go so far as to recommend a simple feeding ph. they also make a point of explaining the media can break down and ph change over time, which kind of seems like a back door way of saying you're on your own if it screws up.
i ph'd at 6.3 when i last ran promix. the formula has changed since then. it's got dolomite to balance ph now.
hp itself notes the media should self balance between 5.9 and 6.2, but won't go so far as to recommend a simple feeding ph. they also make a point of explaining the media can break down and ph change over time, which kind of seems like a back door way of saying you're on your own if it screws up.