It isn't too late, Marianne...are you sure? Denver is quite a drive...when are you likely to be coming back over the hill? I can certainly hold them for awhile but if I let them go in my tank I don't think we'll ever be able to find them again.
Cremer9...right now delivery will probably be November 15, 16 or 17 so that should work out perfectly. (I never know what to trust with a hermit crab...many will kill snails even if the shell is too small to use. In general, nudibranchs aren't tasty and get a pass, but who can predict? I honestly don't know how active hermits are at night when the berghia are feeding...I've never really noticed them moving around in the dark, but my nighttime watching has never focused on them.)