I started my six shooter in a medium made of canna...

Hi @420hixoberry! You're on the right track, mixing coco coir with soil makes the perfect medium for growing autoflowering strains. I do almost the same, but instead of peat moss, I usually mix with some pre-made LightMix from Canna or Biobizz. These mediums have the ability to buffer the pH and they do a better job when it comes to handling micro nutrients. Your mix will be light and airy but I'm afraid it will retain too much water and won't have enough nutrients for more than ~2 weeks, so pay attention to your plant's reactions (mostly leaves coloration and shape) and give it a good meal with some root stimulator and Nitrogen once you will see the first signs of a deficiency (slight yellowing at the bottom, slow growth..). The more coco in your mix, the more nutrients you will need to add later. Also, using more than 30% of coco coir in your mix, you will have to use a pH pen and make sure you waterings are within the 5.8~6.2 pH range. Hope this will help, keep us updated and happy growing! 👊