some rusty spots on my leaves NEED HELP,PICS

i have a ebb and flow table,first time hydro,thats in perlite and just covered with a layer of clay pellets to hold the pots from floating,ph 5.7-6.2,nutrients 0.2-0.3 EC ,thats 100-130ppms on a bluelab meter,iv been growing for 2 years in soil but never had problems like these starts on the lower leaves so i thought its a deficiency but i dont know what it looks like rust,they are 7 days in veg. clones from a white russian plant

I'm not sure, but it looks like a slight phosphorous deficiency. Check out this link from Rollitup for a better answer than I can offer:
https://www.rollitup.org/general-marijuana-growing/1469-marijuana-plant-problems-cures.html

anybody else

What kind of nutrients are you using?

GH floranova and some subculture and supervit hesi,today i sprayed with some cal-mag and added some to the res. water,thats the onl thing i can think of,is ph 6.5 too much for hydro