Help a old guy out

I’ve got two Ace Killer one has issues the other doesn’t??
I’m thinking I’ll go to the drug store tomorrow seeking a bottle of something.
PH normally around 6.< > , if I’m between 5.5 & 6.5 I’m okay with that.
I feed with fish [neptunes], and liquid kelp, water, kelp, water, fish, water.
Happy Frog soil.
Soil has 7 on PH.
I use Langbeinite 0-0-22 plus Bone Meal 3-15-0 as a top dress during flower? [your opinion], I haven’t gave them any cal-mag for awhile ran out, I’m thinking I probably answered my own question with the cal mag, but I’d like y’all’s input.
The last picture is the healthy one.

I’d be grateful for any help.

Containers are rather small, it would be hard to keep consistent moisture and that can affect nutrient uptake and ph swings.

Week 3 of flower?
Fabric containers are much better option since there is no risk of root entanglement.
Ph of your feed and water should be at 6.5 since plants like consistency.

Try and measure runoff ec.and ph if its ok maybe consider feeding them a slightly stronger solution and see how they respond.

Outdoors is crazy lately I remember back in the day when I started my growing I managed to grow some real good weed with not even close to level of knowledge that I have today.
No ph meters or even knowing what ec or organic is. The climate and weather was more forgiving and plants were thriving. Last few years extremes only, pests, desease etc. Considering even to start doing it indoors since outdoors I am getting my harvests sub optimal due to all the factors out of my control.

Nice plants anyway. Good luck.