Leaves on newly potted clones turning yellow - Help

I recently got 6 white rhino clones 5 days ago, i planted them into quality soil in my tent and am vegging them 18/6 under 600W MH. They started growing from day 1 but recently a few leaves on new and old growth have turned a bright yellow coulour! The yellow seem to work its way up from the middle of the leaves.

What could this be? should i give them some nutrients or is this common with newly potted clones?

Peace out

thats alot of light for clones.

if the soil you planted them in didn't have any nutes in it, then they are gonna need it. What's your waters PH? How big of pots were they in, and what size did you put them in?