Hey guys, just need a little advice on my medium which I am going to try on my next grow. I am thinking of buying Canna terra professional, then adding some blood,bone,meal to it, and then 10percent more permits as this soil already has perlite in her. Also would adding some worm castings be good too ? Was also thinking of using cave bat guano on top and watering through in flowering stage. Help is really appreciated guys thank you .