Northern Lights A. #1 (first grow)

I had red spiders on day 10 so I sprayed a mix of water/oil/soap/lemon that seems to have resolved the issue. On the top of that the stem seems to be be very weak (probably due to the first big stretch). I added some soil at the base and it looks ok now. Those two issues seems to have stressed the plant. Leaves are style coming out but my little friend is not growing anymore (in terms of height), also I have the impression the growth is quite slow for an auto... What do you think guys? Any advise would be more than welcomed! :)