i just saved 3 hermit crabs from horrible conditions.... and my 20 gal. tank is getting kind of crowded.... the place i save the crabs from just got a new shipment of jumbo crabs and like 3 have their abdomens showing and keep getting attacked for their shells.... i desperately want to save them but with 8 crabs and only a 3 gal iso and a 20 gal main tank i don't know what i can do. i have shells than will supply them, i just don't know if there is a way i can make my tank more spacious for them to join. does anyone know how i can add more space in my tank?!?!?!?! i am almost completely broke and any home-made tricks or freebies are greatly wanted?!?!?!?!?!?! if possible... does anyone have any way i can make or get a 29 gal tank for really cheap or free? i don't want those crabs to die!!!.... i gave the pet store my biggest shell and one of them switched into if immediately! then they were all fighting over it and i felt so bad! someone PLEASE HELP ME! i am desperate! i am majoring in fashion design and i can make someone something in return or send them some smaller shells or something! please!!!!!!!