This one is smaller than the other one as well right? See it looks like it is stunted somehow...and it is making more smaller leaves than the other plant or is that just what the pic looks like? It is also kinda spotty...Hmmm...can you nute one and not the other? Are they the same strain or different? or are they like some bag seed?...because the more I look at that one I feel like something is definitely wrong...especially when compared with the other one...I use coco, a little...but i hand water...I tried DWC a few years ago and it was a major fail...lol. So...I am not sure I could be of much help anyway, but for real one looks awesome, and the other looks stunted, or like a bonzai tiny plant...Not sure why...as long as your pH is good and all that...sometimes seedlings are just crappy..sometimes it goes away and they start growing normally...and other times they are just like a handicapped seed or something...lol. I am not sure what makes that happen...
Out of seeds I ordered one time I got one I tried and I got so mad because it germinated sprouted and then died...like it sprouted out and then forgot to keep growing roots, so right after the plant sprouted up it grew it's true leaves they close together like prayer hands and then it died...upon inspection it had spit out the leaves, but grown no root...