Can't find anyone else with THIS issue

yellowing of leaves is a common indicator of problems but this isnt the tips its the new growth and inner bits of leaves

pics are a bit blurry but should show enough

any help is welcome

what are you running for a grow area, lights, nutes, dwc/soil/etc..

what nutrients r u using & what is ur ph? maybe iron deficient

using LED, ebb and flood with pebbles and rockwool , Iconic grow nutes (3.5:1.2:5.4) EC showing 1.87 ish which is apparently a little low but i'm using a little above what it says on the bottle
I'm pretty ghetto and havent been able to buy a digital PH meter yet , so having to use that lame ph water test kit pish but its showing 6-7 ish but i hope its not that since i'm nbot able to fix that quite yet because the next time i get money i need to buy tank heaters as ATM using a fan heater to heat the tank which PWNS my electricity

if it is iron defficency how do you go about upping one nutereint? can you buy a bottle of iron? :S

your ph is too high for hydro. your cutting out nutes just with your ph alone. 5.5-5.8 is where you need to be after nutes are added. buy some ph down shouldnt be more than $10(walmart aquarium section). even ghetto can grow kill, im a testament to that. remember that every point of ph is is 10x the the ph of the next point. each point makes a big difference in what your roots will absorb. most newbie mistakes are ph, followed by overnutrients. ease up on nutes, get your ph set and add your nutes back in after a week.

thanks guys get paid monday and shall invest in some Phosphoric acid