Your seedling looks perfectly normal for some strains of cannabis and is not a sign of poor nutrition or anything else.
At this stage, once the seedling has a couple of energy producing "solar panels", it will then concentrate on getting its roots going for a few days before getting leaf growth underway. Don't worry, it does not need fertilizing, just a bit of time to "get its act together", before taking off.
The lime green colour is caused by the chlorophyll also taking a bit of time to get its act together and of no concern at this stage of life.
Hope this helps,.........
Organoman.