Leaves randomly yellowing

[desertxvenom]

Cheers everyone.
Here’s a couple of pics from the leaves today but i assume that losing a few of these but fixing the issue should mean that the plant will still be fine?

 

[kfigerm]

will be, if really fixed.
The big fan leaves are the big reservoirs of nutes, and they are sucked off first. As long as only they are affected, your are in a good position. Watch out for the rest, but don't fall to micro-controlling. Try to keep things smooth and don't go crazy.
If ysou had a PH off you may see some more little ugly things until fixed properly - that may take some time in soil. If it's "only" a def, you should not see further yellowing on healthy leaves.
Cheers