Growing

Soil looks very dry, give some more water. Probably also the RH is pretty low.

Why are you putting it into a dark room at night??? Autos do not care about the photoperiod aka the light cycle. They flower under any condition including 24/0, its not recommended but they can do it if need be. The darkness if only stunting its growth if your giving more then 6hr of it. Also moving the pot that much might compact the soil a bit and cause root issues. There are some other things to factor in like how strong the lgiht is, but we can worry about that later once it starts to grow. the sun if great. If its not growing overall. it might be because it needs food. Would be best to start a diary with other photos so people can see how your growing and what your feeding. Some mediums are void of nutrients or it so low nothing can survive in it with out it being amended. Autos also do whatever the fuck they want and this might be the case of that. But I would expect it to be showing other signs.