are these shells ok? someone from another site who has been crabbing since like the 1990's reccomended them to me Sea Shell City - Bulk Shell Mixes (i am talking about getting the small mix or the medium mix) my problem is it doesnt say if the given sizes are for openings or for how long across it is. my smallest crab opening is about.5 inches and my biggest crab might be a bit over one inch so what do i do. wait my smallest crab is to big for her shell and my biggest crab is to big for his shell. i feel really bad because i always see my biggest guy looking at the 4 choices i have but he doesnt like them he is always rolling them around and feeling inside of them so i know he wants to switch but the pet stores only have D shaped opening shells.