in other words.. ppl are needing to know what cycle your in. Veg. or Flower?
12/12? 18/6? 10/14? 11/13?
ahhh well there ya go man. that's got something to do with it.. I can almost promise you that much.
you've had two plants.. growing in the same pot for 40 freaking days man. The roots have tangled.
You should have seperated those babies a long ass time ago. Like within the first week of their lives.
You could try and seperate them now, and just hope for the best I suppose. But, I would just start over.
Good luck. Take this one as a lesson.. trial and error.
peace.