Is there such a thing as a freshwater Lobster or they are crawfish? I asked that because when I went to the store a month ago I brought what I believe was a blue lobster, ( It sayed blue lobster in it ) and today while telling some ppl that I have one at home, they replied saying that there is not such a thing, that they are craw fishes. What is the difference between them, I mean I know what I lobster looks like and what I have in my tank looks like a lobster only that it is blue and small. any help plz????