re: Adding shrimp to crawfish?

I throw them in about a minute or two before I cut the heat. I use a homemade boil boss rig to cool the pot down so I want to make sure they are cooked before cutting the heat and soak at 150 or lower. Works great, never any issues with overcooking. I also use 10/15 shrimp so the smaller you go you may need to adjust down the cooking time.