Mysterious Hermit Crab Death

MissG55

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Near Dover Kent
My first death and i am only 6 weeks in and utterly confused. :unsure:

I woke up this morning to find 2 of my 6 blue leg hermit crabs dead. They were on the sand bed and completely out of their shells with their soft bodies missing. I immediately tested the water and all fine: ammonia 0, Nitrite 0, ph 8.2, NItrate between 5 and 10, phosphate 0 SG 1.025 Temp 27.
I later saw one of my peppermint shrimp running around with what i assume was his body - i failed to catch him and remove the body before he went and hid in the rock.
The most mysterious part of this all is i have since counted 5 hermit crabs in the tank, none of which look particularly small. :huh: Bought 6, 2 died, 5 left!!

I had a hair algae bloom while i was away and have added rowaphos.
At the moment i have 50l of water heating and mixing ready to do my first big water change.
Previously i have been doing about 10% changes a week(25l). Is this too much/ not enough?

Any help would be greatly appreciated.
Thanks
Donna
 
Definitely would assume molts first and foremost, but incase they didn't molt I would just like to add that I did at one point have a peppermint shrimp that had a taste for hermit crabs. Caught him in the act, he ate 10 within 2 nights. But that is, of course, rare.
 
Definitely would assume molts first and foremost, but incase they didn't molt I would just like to add that I did at one point have a peppermint shrimp that had a taste for hermit crabs. Caught him in the act, he ate 10 within 2 nights. But that is, of course, rare.
Will have to keep a close eye on peppermints too!
Have not found number 6 yet but have found the shell he was in...empty. Iknow they swap shells but this one was in a crevice under a rock so it doesn't look good :sad:
 
I have about 20 hermits in my tank am lucky if I see 5 or 6 in a day he is most prob in a crevice munching away :lol:
 

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