Too much??

[Scorpion]

is there such a thing as having too many snails and/or hermits in your tank? i was thinking about getting:

- 10 dwarf zebra hermits (left handed hermits)
- 10 blue leg hermits
- 10 red leg hermits
- 20 nasarius snails

our 33 gal tank has:
- 1 yellow tail blue damsel
- 2 false percula clowns
- 1 skunk cleaner shrimp
- 1 helmet cowfish

we have some hermits and snails now... but alot of them died/disappeared. not sure what happened to them.