I'm going on a vaction, will my hermit crabs be okay?

Well I'd add an extra water dish, and give them a few extra hermit crab cakes in their food dish. I give mine a mix of hermit crab cakes, hermit crab meal, and 1 or 2 different types of tropical fish flakes. Remeber, hermit crabs need 2 water dishes, one with normal drinking water and another one that has aquarium sea salt to help with molting. So since hermit crabs mostly drink out of the normal drinking water water dish, I'd say give them another one. And if your only gone 2-3 days a little extra food will go a long way for them.

Yes they should be fine. Hermit crabs are easily left on their own for days at a time with no help. But make sure you have water readily available for them. Hermit crabs MUST wet their gills several times a day-even just 3 days without water would be bad. I would also make sure to clean their cage before you go-since hermit crabs are sometimes little bastards that like to make messes when you don't watch them lol

Yes they will be fine! I would put a little extra food in the cage and also make sure there sponge is really really wet, so they have enough water and they should be ok.