French macaroon clones

This is the 4th week from cutting of mother. I noticed clone 2 has the clipped fan leaves turning yellow. Clone 1 does not, so I'm hoping this is fairly normal. I've been keeping the nutrients half strength through this week and will switch to full strength next week. I dropped the lights down to 18" to get an average of 580ppfd at the plants which gives 38 DLI for the clones right now. Hoping that the roots take off on week 4 and I can put them in their permanent 3gal pots.