That is an awesome temporary setup!
I don't know much about vampire crabs (other than I want some)! Do you know a good place to read up on them?
I also feed my crabs dried brine shrimp & krill for the nutrients in their exoskeletons as well as hermit crab pellets for the fish meal ingredients. But they do love bloodworms & algae pellets are their veggies.
Alright I have some questions. Online info is very very confusing. Alot of people say these crabs are terrestial and therefore need very little water.
I was going to setup a 20 tall for them. I figured fill it 50-75% with water and have rocks, driftwood, and plants on top for "land" access. Now I dont know if that would work? Do yours use the water or stay on the rocks? If they dont use the water I may stick with my original plan and get waspfish....
Mines have rarely gone into the water I pretty much always see them in land.