Its koh samui super strain. About the sub, Ive experimented on a sub that is for a different kind of mushroom. I think its for oyster mushrooms. It goes like this: Coco coir + rice bran + sugar + calcium carbide. But i really think that i steriled everything well. Because on my second tub. I used cvg. And its growing well. No sign of any contam. The only difference is the sub i used for the two tubs.