Who is eating my Crabs and Snails?

[wildbunch]

The fish I have are: Juv. Emporer Angel; large Naso; ciniamon Clown; 4 damsels.
I used to have an snowflake in the tank, but removed him because I thought he was the one who was taking everything out.
I just recently purchased a fairly large green hermit crab. Haven'
t seen him for weeks now. Have know clue what could have killed him.
Any help would be great.
Thanks

 

[iechy]

If you haven't found his empty shell or carcass it is possible that he is still in there somewhere. i went through the same thing and thought all my hermits were dying because I couldn't find any of them. Then when I changed the flow of my powerheads it must have started moving wastes that they feed on to a different place because they all came out and are all over now.

 

[wildbunch]

The Crab is out of his shell in the corner, Dead. I have no idea why Crabs / starfish won't make it in my tank.

 

[jonthefb]

what are your water parameters like? how old is the tank, etc
jon

 

[wildbunch]

Nitrite's = 0 ; Nitrate = 60; Ammonia=0; Salt= ok; PH=ok
I just found one of the crabs in there that I bought 2 weeks ago, so I have one left.

 

[jonthefb]

trates are extremely high, how long since you have done a water change?
jon