Halloween hermit hitch hiker?

TheBear78 · Jan 22, 2023

Evening all,
One of my Halloween hermits has this attached/growing on his shell (the white sectIon on the left end). it looks like some kind of snail shell but hasn't moved from this spot in several days if not weeks. Any ideas? It's unlike any other snail I have in the tank so I'm a bit surprised how it would show up randomly after almost a year!!
Thank you.

ISpeakForTheSeas · Jan 22, 2023

TheBear78 said:
Evening all,
One of my Halloween hermits has this attached/growing on his shell (the white sectIon on the left end). it looks like some kind of snail shell but hasn't moved from this spot in several days if not weeks. Any ideas? It's unlike any other snail I have in the tank so I'm a bit surprised how it would show up randomly after almost a year!!
Thank you.

Given that's it's growing and hasn't moved, I'd guess a sessile, filter feeding snail species of some kind like slipper limpets or hoof snails. Unfortunately, I can't offer a solid ID based off of the photo provided, but if doesn't move, it's almost certainly harmless.