Red banded trochus are very hardy for me. All mine I bought from the LFS in the wholesale shipping bag before they tanked them. I only temp acclimated them, tooth brushed their shells, tossed them in and immediately they started cruising around. I now have probably a hundred trochus snails at all different sizes as they are very hardy for me and breed readily in my tank.
It sounds like another issue from my perspective. Was it moving about at the fish store?
It sounds like another issue from my perspective. Was it moving about at the fish store?