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.