First Grow

It has nothing to do with the container, but is just the result of your plant being a little confused about "all this growing thing" it is meant to do. It seems the newest leaves are growing fine, so your plant is now on the path to flowering and the funny leaves are nothing to worry about. If it continues then your plant might be a bit weird and deciding on its future should be left for another week or two. It may be worth planting a replacement in case this plant continues being weird and does not grow properly, which would indicate a "genetic flaw" with this particular seedling. Hope this helps,.......... Organoman.

Erm yes you can use neem oil that would be a good short term long term though you want to look into predatory insects and the best one for both of those little buggers is pretty little lady birds not only do they look cool af they eat upto 50 mites of aphids per day and live upto 1.5 years with a good food source. They are alot really cheap any garden centre sells them live and you can even order them on the internet live straight to your door and on top of that it does not harm your plant one bit and is fully organic :) Best of luck