Not suggesting anyone else try this...but I have a stars and stripes, porc, and huma huma in a tank. I put in 7 fighting conchs (chose them because they can fully retract into the shell if knocked over), and thus far I have not lost one. It's been about 2 months now. I never see them...ever, but the other night I sifted them all out, and they are still alive. I also have 1 VERY stealthy zebra hermit...lost one claw when I first put him in, but now remains unseen except for night. Today I added a strawberry hermit..he is learning quickly from the Huma. I also have 5 turbo's in this tank. They get their shells nipped at from time to time, but they just clamp down, and I have no problems. I will next try a serpent star as I have one in another tank, and it stays very well hidden. Just trying a variety of things to see if any can last, but with the expectation that I will loose most. So far so good
, we shall see.