Here is info about the strawberry hermit crab
Strawberry Hermit Crab
The Strawberry Hermit Crab is quite different from its algae-eating counterparts. This is a much larger hermit species that needs lots of room and food. It is a scavenger and predator; in the aquarium, it can be fed bits of meaty foods like shrimp, scallops and smelt. These hermits are not reef safe and should not be kept with smaller invertebrates.
As hermit crabs grow, they need to move into larger shells to accomodate their larger body. The Strawberry Hermit Crab needs to be provided with large shells to grow into. This type of hermit crab could easily grow large enough to live in shells softball-sized or larger.