30 days flower, pistils turning orange/rusty brown and yellow spots leaves

hey what's up? I've got 5 chemdog going and seen that on of the plants the pistils are starting to change color and brown spots on the leaves close to the buds like its nute burn or something , I feed them every watering with 20 mL of iguana juice bloom and 1 tbs of HPK by roots organics per gallon of water I don't PH my water.
any ideas?

I said fuck it and she's compost now lol

your mls are a little high on the iguana i use about 3/4 of what they say, 10-12ml a gallon