I went out yesterday to a beach I know of in the middle of nowhere and found a whole buttload of different size conchs ( I guess they're actually whelks ). I added a few of the ones I could clean up easily, but she still likes the small one, although she checked the others out. I'm not certain she knows what's going on... she responds to the male's quivering, and will even lead him to the shell, but form there she doesn't seem to know what to do. She ducks into the shell, and then emerges to watch him shake in front of the opening. Then she goes to the other side of the tank and flirts with the Gold Calvus male. Typical teenager I guess. The black male stands gaurd at the shell, he apparently knows the drill.hey afro i have an assortment of shells whale eye, escargot and marine shells, i do have a lot of extras on hand with the escargot shells if you need some let me know i can send you some, my personal fave are the smaller conch shells for calvus and actually thats how i caught mine to move to the 120gal is scared them into the shell and removed the shell from my tank really easy at that point, i believe the escargot should work but as you mentioned may be too small later on, we have a hobby lobby that sells the small conchs at an affordable price, later buddy..