OG Kush Problem

I am a beginner, but I have two plants growing in a hydro setup. One is OG kush and the other is Berry White. The berrry white is growing perfect, but the bottom leaves on the OG look like they are rusting and the mid level leaves look a little blueish and papery, and the new leaves coming in look fine. all the leaves on the berry white are green and perfect. I mean i figure that sativas and kushes like different levels of nutrients, but what can i do to fix it. I am using a rubbermaid 18 gallon setup so both plants get the same nutrient mixture.

Here are the pics. I couldnt get the one to rotate but the og is on the top, or left if you rotate it. berry white is of course then on the right, or bottom.

No one has had this problem before? also was wondering what ph level should be for foilage spray?

******
well what info do you need. this is my first grow so i can't really break it down for you. i keep the ph around 5.8 and i am using a grow solution called botanicare pure blend grow pro 3-2-4 vegatative formula. im using a 400w metal halide that sits about 20 in. away being powered by a lumitek ballyst. i use 1 tbl spoon/gallon.

You really need to give a lot more info.

It looks like calcium def. You probably need to get your PH down but then...you didn't say much.

well what info do you need. this is my first grow so i can't really break it down for you. i keep the ph around 5.8 and i am using a grow solution called botanicare pure blend grow pro 3-2-4 vegatative formula. im using a 400w metal halide that sits about 20 in. away being powered by a lumitek ballyst. i use 1 tbl spoon/gallon.

how many gallons are you filling your reservoir? Drop the ph to 5.7 og really likes a low ph....

Im filling the reservoir with 10 gallons.