I have these few plants with these yellow leafs on bottom there gsc and sour lemon... I was wondering if the were ready for me to start with the fox farm nutrients
If they're too small, they sometimes don't have enough to survive the cloning process.Some strains take a long time to clone, a bigger cut has more reserves to pull it to the end.
I'm thinking the first picture may be a bit of nute-burn which is little to no problem. Second picture looks like the plant is starting into flowering phase. That is natural and harmless. As the plant gets older it transfers the energy it produces from vegging (growing roots and greenery) to flowering (bud and resin production). Think of it like a teenager growing fuzz on his chin.
I would leave them alone as I don't see any real problems.