Dean11VipaspectraP2000

that little seedling is looking hurt. Its showing signs of stretching as if the light was not close enough. and something that lookds like nutrient burning on the tips of the new leaves. If the soil was coco was it buffered before hand? If not it needs a heavy dose of calcium and magnesium. But it may drown out the seedling if its just coir and nothing else like perlite. If it was not washed before hand as well from a less brand, it will have a high salt content that could also hurt the seedling. Was the coir fortified beforehand with some food for them to get zero nutrients so fair? Coir is void of nutrients, so it needs to be amended. Let us know your responses to this or PM me. Best of Luck,

Given that is was stretching a lot in week one and light was to high, I think the good looking green plants are doing pretty good. Stunted but healthy. The yellow one maybe more hungry. Or have to much feed in the soil. This link is one I reference a lot for auto feeding guidelines in terms of PPM/EC I'd suggest giving it a look and seeing if its similar to what your doing. https://www.autoflower.net/forums/threads/med-man-method-feeding-chart-ppm-ec.47856/ Best Of Luck!

Autos are a tricky beast, but they do not go back into veg. They do not require a light change to go into flower, that is known as a photoperiod. This is how photoperiod plants got their name as they require the light change, and autos theirs as they automatically flower. With autos being tricky they will enter their flowering phase right away if they are stressed at all in the slightest. They also sometimes just do what ever they want as they are special like that. luck of the draw kind of thing as their genetics are all hybrid. Something to help you avoid this. Don't over water, over fertilize, use to much light, or transplant them. All these things will cause them to be stressed and can make them flower early. Best Of Luck!