#1st grow

So had some issues last week, I saw some little fly’s when I moved one of the autoflower pots and then noticed the same with other two autoflower plants but none on the other plants being grown in coco. I done a bit of research and found out that they were gnats. I removed all 3 auto plants out of the tent to outside. I used half a Pot of cinnamon for each plant, put a thick layer over the top of each plant soil mix and after 4 days not seen no movement at all it is a natural remedy that was suggested to me and it really has worked 🙏🏻. I have now decided to keep the auto flowers outside. I think the gnats might be from the soil I used as I also have a plant outside that has the same issue with the Same soil mix might be wrong though?