I ordered some mystery snails and they arrived today. the rest of them seemed to be perfectly fine, but one of them has a pretty large crack in its shell. Fortunately it doesnt seem that any of its body is bulging out, and theres not a gaping hole or anything, but the crack spans across a large portion of its shell. I could just get it replaced from the company, but i would feel terrible for the poor little snail if i just let it die. So, I researched some repair techniques ranging from using marine epoxy, plaster of paris, crazy glue, nail varnish, and eggshells, but im not sure which is the best. I feel like using epoxy/plaster may be overkill since theres no actual shell missing, but I'm not sure applying straight nail varnish or crazy glue is safe. Which method seems the best to use in this case?