Quick help with this plant problem (pics)

Hey, I just added some 20:20:20 RapidGro a few days ago to correct what I thought was a phosphorous deficiency (it ended up being a strain trait), and today I'm noticing leaf problems - brown and dying on the edges on 2 leaves. I'm thinking it's just an over-fert problem and it will clear up on it's own - correct?

Side note: don't use RapidGro, I have problems every time I apply it.

yep looks like your over feeding. Just give them a flush and they will come right, i find it helps, you may not need it. Just cut back to half strength for a bit. Peace