Phosphorus Def?

I have 3 plants that are all showing signs of P def. They are dropping crunchy paperish brown leaves, many of them have red stems. i went to my local hydro store and picked up Grotek Monster Bloom, it has 0-50-30, NPK. recommends 1tsp every 5 gal i put 1/4 tsp in 1 gal of ph'd water, put into spray bottle for foliar feeding, i also took the same mix and watered with the mix. will i see improvement over the next few days?

if not, then you don't have a P def. sounds like you did the right thing.