EPSILON F1

Been having a difficult week, last week I stirred my water with the ph pen which it didn't like and I was running low on feed so had to give weaker Non ph'd feed which they definitely didn't like and they started fading fast I've now got a new pen and some biobizz bloom, since the last couple of feeds the leaves seem to have stopped yellowing, I'm getting some cal/mag tomorrow just as a precaution as some of the leaves have red stems, and looking at the trichomes they are not far off at all, 1 plant is more advanced than the others but don't have a lot of choice but 2 wait for the other 2 to catch up