Fruiting! But also...unhappy?

It's pretty amazing to see tiny baby bell pepper appear. it's so dang cute. My cherry tomatoes are

Red Bell Pepper forming (June 21, 2017)

doing awesome (as expected),  those are so easy to grow though so it's not that special. My Fresno pepper has started a tiny baby and I couldn't be happier. I haven't seen any serrano peppers yet but it has a lot of buds. Also no cucumbers yet, again quite a few flowers.

Baby Fresno Pepper! (June 21, 2017)

My only complaint is they don't seem very happy. Their colors are all off (except for the cherry tomatoes). They seem yellowish in color and I am not quite sure what to do about it. The fresno pepper and serrano are growing taller despite this yellow color, but the bell pepper plant (even though it has 1 fruit growing) isn't getting any taller. The cucumber is climbing the new trellis my Mom helped me make, but it has the worst color of them all.

No cucumbers yet, but unfortunately have some leaf miners :(

My Mom says they may need more nutrients, which is crazy to me because the fresh soil I put them in should still be enough. But, maybe not. As a precaution I decided to fertilize again and hope they turn around color-wise.

All of them are yellowing except for the cherry tomatoes on the far right. I added the stake/twine trellis for the cucumbers to climb this week. Also bought a tomato cage. (June 21, 2017)