Oldest Invertebrate in your tank

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This is Egg, she is a Dolabella sea hare that has been the resident cleaner in my 125 for the past three years. She came from a previous home where she was adored by her last owner who had her for a couple of years as well. While I don't know her exact age I know she's between 5 to 7 years old. Which for these guys from what I know is basically geriatric. Google says their average lifespan is 12 to 16 months so I'm very happy she has been living a long happy life in captivity. What is the oldest invertebrate you have owned or come across?

 

[Euphyllia098]

I've got an almost 7 year old blue legged hermit crab. Weird part is that I originally had 5 or 6 but all but 1 disappeared in the first 6 months and he's been hanging in there.

I actually thought he was dead but when I transferred everything to my new tank 6 months ago there he was.

 

[Nordy]

I have 3 electric Blue knuckle hermits that I added in late July of 2024 and they are still getting around well. 2 of them are in descent size Babylonia shells and the other is in a good size Mexican Turbo shell. I really enjoy hermits and have thus far not noticed any going after healthy livestock, but maybe these guys obtained there houses when the snails were healthy.

 

[Nordy]

Halloween hermits are a favorite, but after the 2 year mark noticeably decline, same for conchs in my systems. You’ve probably heard the saying, “*^s, grass or cash, nobody rides for free.”

 

[StartingATank]

Technically, my anemone is super old, but does each time it splits count as a new life?

 

[Üter]

I've had a Blood Red Fire Shrimp for about 4 years.

 

[Paul B]

This pair of Hermit crabs lived about 10 years. The female is the one with the sexy, above the knee shell.



This urchin died last year the same age, about 11 or 12.



This pair of Coral Banded Shrimp lived for 7 years and spawned many times in the 70s.

 

[EricR]

I've had my tiger conch for over 5 years across two tanks.
Was already full size when I bought him/her so not sure about true age.

Not much of a picture taker so here's an old one:

Beyond that, I've only ever bought 4 nassarius snails.
That was also a little over 5 years ago and those same 4 are still in my tank.
*no other non-coral inverts have made it that long for me

 

[svn007]

My tank is new... have a few hermits and trochus snails - not sure how old they are... and a baby pistol bonded with my watchman goby .... a real fun to watch bond!

 

[svn007]

I've got an almost 7 year old blue legged hermit crab. Weird part is that I originally had 5 or 6 but all but 1 disappeared in the first 6 months and he's been hanging in there.

I actually thought he was dead but when I transferred everything to my new tank 6 months ago there he was.

One of my hermits disappeared for a few days. I found his shell .... then soon found out that one of my snails got legs :D ...

 

[BryanM]

I've got a couple of massive mexican turbo snails that are over a year old now.