Quite honestly I think they both look good.....that clone is going crazy and your seedling has caught up to my two size-wise it seems. :thumbsup: I highly recommend a full on water change to new nutes.

Part of your ppm is whatever is in your tap water. What I'd like you to do.....when you have time is take some tap water and add 100 ppm of Flora Grow to your tap water and then change your resevoirs out to this. Keep ph the same as always. (It won't take much so add slowly....) You'll see them start to grow faster as you increase nutes......they can go to 24hr drip too.....they're plenty big enough.