FW Crabs

[maverick_8teen]

I have an "underwater" King Crab. I have had him (or her) for about a month now. Its leg span is about 3-4 inches. i have been told to feed it crab bites (dry food) and was also told to feed it bloodworms. I have it in a 7 Gal tank...thinking i need to upgrade now or soon atleast but im not too sure. Does anyone have advise on them. Proper diet? Size of tank? (as stupid of a question this may be) Do they need an air supply? Maybe some random bit of info that mght come in handy later?