Fox farms works it into a schedule about every 4 weeks. I is both prevenative maintenance and regular action. Different ratios of nutes required at various stages of growth. Flushing helps keep that ballance.
Outside of that. If your runoff ph dips bellow 5.8, good idea to flush. Runoff isnt exact, its more like a guide. You record it, to monitor trends. If the tds drops bellow 1000, feed.
Pretty high ppm but FF OF starts high cuz its loaded with nutes. Then there is the MG. Loaded with time release nitrogen. This plant gonna be a lil difficult going forward, if she is still freaking out in a few days may need to flush out that soil more. Water ph and ppm is perfect. What was the ph of runoff?