what could it be :*( +rep (Pics!!)

hey guys i currently got a few plants going and in the first pic is the bubalicious autoflower and it seems to have some yellowing leaves and brown spots i have another bubalicious but its not having this problem and any ideas on what it could be? another thing ive been reading that the auto's dont really autoflower is this true should i wait till there about 12 inches and flower them myself?? in the 2nd pic the haze looks like it is already flowering it hasent grew much at all for the last 2 weeks same goes with the other haze i have both have about 4 nodes and are starting to show thc crystals take a look and ty for any help you may provide tyy

what and how much nutrents u useing?....my plants looked like that but not as bad and it was over fert. the more info u put the more peeps can help

ye i water them 2 tblspoons of bigbloom per gall every other watering

What are NPK ratios of the Big Bloom? That looks like a P def.

.01 - 0.3 - 0.7

Yeah, feed it some thing high in P. Maybe Tiger Bloom if you're using the FF line.

Use a teaspoon of Epsom salt per gallon with your nutes you have a magnesium def

lol thx for the tips but what will epsom salt doo?