Slower growth than the rest. Same grow medium (sunshine mix #4 and happy frog), same feed schedule and rate. Maybe just a slow starter? If it still is struggling by mid week, I'll start adjusting feed rates to encourage faster growth. Looks healthy and happy.
@Herikus, I'm sure she'll be fine too. I always obsesse when something isn't going how I think it should lol. Happy growing, brother. Nice plants you got going by the way.