that odd leaf in back right of 2nd pic just looks like an odd early leaf.. if you are trying to water too frequently, allow it to dry a bit more for now.. can push more frequent fertigations when it has a proper root system..
coco let top layer change color or if in soil let top 1" dry before irrigating. For frequent irrigation setup, you want at least a 33% loss of water-weight to occur, but again, if roots are young, this doesn't help much and may even slow down how much root mass is added per day early on. Some stress is good stress type idea. A plant not seeking water isn't putting as much energy into growing more roots.