I was watching my tank the other night, and while I watched my bubble system pouring out from under a rock structure I made a tank idea occured to me. Those red clawed crab I've seen most say they require land access. What if you used a air pump system to create a land oasis underwater, this would of course require a structure, preferably transparent, that would capture the air from pump and create a land oasis underwater. The more I though about it the more awesome the idea seemed. Does this type of thing already exist as far as anyone know? If so I would love to see it. I dont have to ability to make such a tank but I can't be the first to think of it.