I bought a 6 lined wrasse yesterday for my aquarium. Because he is going in with two territorial clownfish, I decided to put him in one of those acrylic fish boxes suction cupped to the glass so that they could get used to him. He seemed really stressed out in the box with nowhere to hide, so I added a relatively large snail shell and some liverock rubble. This morning he seems to have disappeared. As far as I can tell, there are no holes even close to large enough for it to have fit through to escape the box, and the lid is on tight. Could he be inside the snail shell? I cannot see him in there from the opening and I've already tried dumping the water out of the shell, and he didn't come out with that water. Is it possible for them to get stuck? I know I should probably just leave everything be and hope he pops up, but this is wild. I've had fish disappear in the tank, but never in an acclimation box with like 5 small things. I could carefully cut the shell open to see if he is inside, but I'm not sure that's the right course of action.