Keep things simple .... forget throwing scraps or guessing .
PH everything... this way you can elimate the water / feed as a problem.
The range for maximum absorption falls in particular ranges , so making sure that is controlled will eliminate most issues.
Be aware salt buildup will throw shit off , especially when using synthetic Nutes. And may need a water only watering to break it up. Enough to get some runoff will usually do the trick.
Noticed how I AVOIDED saying flush. It opens a big can of worms among growers. That method alone can cause even more issues as you are STRIPPING the medium far more than needed.
Overfeed is why that ( flush ) may be needed and “ that “ was caused by grower error , not the plant.
So if you don’t throw the kitchen sink at a plant , then you can correct.
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