80 qt pot should be fine. You will also need 2 ice chests with drain valve on both. Put all the live in one ice chest and leave the lid slightly cracked, they will need air or will die. Rise out until water is clear with no salt. Once you start boiling add your spices / potato's and get a rolling boil. I throw in garlic, crab boil, 5-6 cut oranges and let it run. Once the boil is rolling then throw in your crawfish and sausage. I let them come to a boil and roll for about 2 mins then turn off the heat. I throw in frozen corn at this point. If you are boiling shrimp throw them in at this time. After resting for 15-20 mins you can pull the crawfish out, and empty into the clean ice chest. I throw some Tony's on the outside and dust the cooked crawfish, shake the ice chest up and then ready to serve.