First RDWC grow

It's actually potassium deficiency likely from ph being out of range. Hydro grows don't get nute burn like soil grows. Simply because they don't get dry. I do a 5.8 ph in veg. 6.1 in flowering. Make sure ph pen is calibrated regularly.

Oh boy, what a question lol. Apparently the new information is that flushing doesn't matter. If you are in RDWC i would just flush for a week using a florakleen agent. That will remove3 salt from the roots so the plant will eat it up. I still advocate flushing simply to speed up the process of chlorophyll break down, which is what makes the plant smoke harsh and taste like shit. Studies show flushing vs. no flush there is only about 15% less nutrients in the flushed plant over the non flushed. There is a reduction, but not an elimination, which sort of debunks the theory of "flushing nutrients" from the plant tissue. By depriving the plants of nutrition and forcing them to eat the nutrition within itself, chlorophyll breaks down, which is why your leaves yellow and turn orange and all the pretty fall colours. Plants fed right to the day of harvest have shown to have the richest flavors and aromas (terpenes), and the biggest flowers, if i remember correctly. That's a loose quote from Harley Smith. I believe no flush will take longer to cure into smokable product than a flushed plant. Simply because the flushed plant has a head start on the reduction of chlorophyll through natural break down over curing gas off.