The pics in the auto thread that you posted looks like your soil PH is way to high witch will cause a lock out of zinc, iron, and manganese micro's that the plant needs. You may want to try another soil on the next grow. Also keep your water PH around 6 and keep your water out over night before you PH it so it can evap as much ammonia as possible.
Hope that helps next time it happens
happy growing
Hope that helps next time it happens
happy growing