Bummer on the plants AC.
Funny you mention this. The past week or two I've been giving a lite dose of Fox Farms nutes - a little more than half the recommended amount - but feed every day. If I see yellowing I'll up the dose a tad. So far the plants seem happy. I'll water to runoff with plain filtered water once per week or so to help flush.Lastly, a note about fert values. I was using 100% strength from the Fox Farms schedule and not alternating water between feedings (which I did with the Blueberries, perhaps contributing to their success). Others are using synthetic and not doing F/W/F, so I wanted to push the plants and give it a shot. I think the salts caught up to them, thus your blocking of a tube would make more sense than a giant mesh hole to get them out. My PPM (0.7 scale) was ridiculously high, way higher than 1000. Fox Farms is known to be hot as it is, so lowering the strength would definitely be a better bet moving forward.