Clones Leaves turning yellow

I have my clones being rooting in a clone machine. but my problems is that the clones leaves are turning yellow. I'm using superthrive as my rooting solution. My ppm is 57,ph 6.5. I put my clones right into the solution after i cut them from the mother.

Some leaves turning yellow on clones is normal, the clones are taking nutrients from the leaves to grow roots.

Its normal dude. I usually cut the tips off the lowest two leaves to prevent it. I use superthrive, rhyzotonic and sometimes a little cloning solution to develop roots quicker to stop the plant from yellowing off. Some people say not to use any nutrients but I like to give them a weak dose to reduce stress. Are you foliar feeding?

EDIT: What he said.

Thanks for replies. I'm using hydroponics right now. I'm still learning how to fine tune the process. it had surprised me when they started to turn yellow. the color do come back when i take them out of the cloner. how soon do you take the rooted clones in to the grow medium?

I like to get them into their pots as soon as the roots start to show. Snapping and kinking roots at this stage can significantly slow things down. I don't bother transplanting them from small pots into large pots, IMO its better to put them straight into the pot they will be flowering in. You might need to use a clear plastic container to cover them to keep in humidity for a week or so, but I use an anti wilt spray that negates the need for high humidity. If my main room was still in veg, I would just have my tray of clones sitting on the floor until they were ready to be potted.