Don't get an oxygen tank. One you've got a fire danger it's a very very good oxidizer so things are likely to set on fire if you have all that oxygen sitting around. Two you don't want to get used to it cuz then you'll be gasping for breath in our normal atmosphere. Three too much oxygen can alter your mental state you get weird dizziness and lightheadedness and other symptoms. Four all that oxygen will increase the free radicals in your bloodstream which will lead to cellular and DNA damage may increase the risk of cancer.