yellowing viens

hi all more problems coming i think any one know what could be wrong please on some of the plants the leaves have yellow viens and not sure what is happening but the others are a nice dark green and they all get the same amount of feed witch is bio bizz bloom the. pics light patches on the leaves are just reflection the second pic of the leaf is the proper colour the other 2 leaves are not that yellow its just the light reflection any advice is much appricated

Looks like nitrogen deficiency. How far into flower are you?

im about 3 weeks in to flower mabe 3 weeks and a few days forgot to mention as u can prob tell there af

They sure do look hungry. Around week 4 you can expect some yellowing on lower leaves. But this looks a bit too early and quite widespread. I have used Bio Biiz before and wasn't impressed (I have nearly a full bottle sitting) And found that my girls were also very hungry, it just doesn't seem to have the oomph required. May be that was just me.

A few Q's to think of when assessing what to do.....
Have you changed anything of late? What was it, and if so did this cause the problem.
What strength of feed do you give?
How long has the yellowing been happening?
PH? (I don't bother but if you have got crap tap water then this may cause issues) Perhaps there has been a lock out.

I would go with trying to get some Nitrogen and Magnesium into them. Magnesium is what enables the plant to take up Nitrogen, and as such keeps the plant green. It may be a simple issue like that as Cannabis plants are generally Magnesium whores.

Good luck,

Peace, DST

thanks for the reply and the infomation just been out and got some mag been every where for it but i got it at last

any one else no what coul;d be wrong