Seedling white tips?

Are you using nutes this early on? With the soil you're using there should really be enough feed for their first few weeks without added nutes? Also letting the pots fully dry and feel light as a feather before you refeed/water. Check PH of water too ensure its between 6/6.5ph balance? It could be that you're getting mute lockout really early on with the overfeeding and too much nutes

Very interesting. I'll stick around to see how it evolves.

That is really strange I have never seen that before either this is defenalty a mutation or something with that specfic pheno but im sure it will still grow fine and there is no reason it wont grow the leaves curling down could indicate she has too much water but i doubt it. Just keep an eye on her see how she goes im sure she will pull through :)