Hey Queenie,
I see you're using coco for some of your plants. I just bought some myself today and am curious to see how it goes. Not sure if you remember I posted a long time ago to ask what were those weird orange balls that appear in a lot of coco coir pictures?
Turns out they're used to keep the coco from drying out too quickly. Someone or somewhere I saw a post that said adding vemiculite over the top of the coco will keep it from drying out so quickly.
Probably not relevant anymore, but I think the deficiency you had a week ago may have been a Magnesium deficiency. If it crops up again, just add one tbsp per gallon of Epsom salts to your next watering or fertilization.