Mutation?

18/6 is the way to go, all plants, cannabis included, NEED sleep to finish their photosynthesis cycle and have a correctly functioning metabolism. A plant with an incorrectly functioning metabolism will never produce healthy cannabinoids. The myth that cannabis can be grow healthily for weeks/months without "sleep" could only be recommended by people who do not understand photosynthesis or how plants function and needs to be removed from the internet asap! The leaves do look a bit weird, but I wouldn't worry about them, the first few sets of leaves can often be a bit funny, but they usually grow out of it. I would also advise against re-using anything and always start with brand new grow mediums each and every time, the risk of disease is just too high otherwise. Hope this helps, Organoman.