So after the last res change and lowering the nutes to flush any build up of nutes in the older plants because of pH issues and to have a lower nutes mix for the babies that went in, babies looking good and taking off, very good root growth very fast. The older 2 (45ish from seed) began yellowing in the new growth and leaves when the level of nutes were lowered 2 days ago, upped the nutes a little bit yesterday and they are looking greener. Going to do a partial res change tomorrow and up the nutes back to the previously scheduled veg cycle for another 2 to 3 weeks before switching to flower in 3 to 4 weeks.