...sounds good Chief! In fact, I'd flush them again, with a fair amount of run-off; remember, you're trying to remove excess fert's by re-dissolving them and movin' them out! Run-off of significant amounts is necessary to achieve this. The soil will drain well enough, the paper towel trick I mentioned earlier will facilitate this faster; keep some good air movement on the plants to help them evap' extra water that they're trying to get rid of as well. First though, retest the soil after this first flush you've done, and make sure you get soil from a ways down, not surface stuff- the trouble is at the roots, not on top, right? :check: Don't worry about a little root damage when taking a sample; you must get an accurate reading! (use a small spoon or something like that) The pH I hope will go up some as this is done too....As for the Superthrive, yes yes yes! I recommended that a while back I think, right? It's excellent for treating shock and invigorates the plant (it's not a fert' or even technically a supplement, more of a stimulant) So, retest, and wait and see ..... I know it's sucky, and we're not positive it is nute' burn, but that's still the most likely cause I can come up with..... How did they look today? Any further/worsening if symptoms? If the tests come back with moderate levels, you can skip the 2nd flush for the moment, okay?
edit: pH total lockout for K happens below 4.0, even at pH 5.0 it's still fairly available; this is true for all the other macro/micronutrients... if the soil was down that far, the plant would be toast already!
