probably nitrogen and calcium since theyre two and two together. potassium is coming next since you just went through some stretching but the stretching using up proteins which is why its sad.
got blood meal, and lime or gyspum? maybe toss in some epsom salt if its around the house. if not its probably in the flora bloom but double check.
soak some gypsum or lime in a small cup of water. not much like a qtr cup of each. theyll seperate but the water will turn dark. swirl it around every once in a while. use a tsp or less of this water and save the rest for later and add a tsp to 2 tablespoons of blood meal to a gallon of water, add your flora bloom as you planned,
so really resume feeding as you planned but supplement a little nitrogen and calcium for a feeding or two. watch for more leaves turning yellow. if there are more leaves turning yellow then the problem is likely a ph thing but nothing crucial since your plant isnt all wonky and wavey