Snail and hermit lifespans

[Dearth]

Blue and red legged hermit crabs have an average life span of 3-5 yrs in captivity.

Most snails live about a yr some species are shorter others are longer

I've lost about a third of my crabs to various things and have had some crab procreate i have 4 blue legged hermits born in my tank but my snails have been voracious procreaters I've only got one snail left from original batch and I have about 18 or so in my tank that were created and born in the tank.

If you don't have a lot of detritus your CuC can starve to death as well it could be one of many possibilities