Basically for the switch from CC to sand....I would drain the tank down, remove your inhabitants to a QT, and scoop it out the best you can. Then re-add the sand, let it sit for a day or two, then re-acclimate your fish.
The clown and damsels shouldn't hurt the crabs....or vice versa....but I would worry about them hurting each other. They can both be very territorial species. |