Shrimp Dying...Help!!!

Surfside74

New member
OK,

Let me start off with tank info. I have a 57 gallon mixed reef tank. It has SPS, LPS, chalice, zoas, rock anemone, and a clam. I have not added anything new to the tank for sometime other than corals. I only have three fish: 2 Black ice clownfish and a purple firefish. I have blue leg hermit crabs, zebra crabs, red leg crabs, turbo snails, mexican turbo snails, and a harlequin starfish. I had three cleaner shrimp, two blood shrimp, and a peppermint shrimp. My parameters are as follows:

SG: 35 ppm
Ammonia: 0
Nitrate: 0
Phopshpate: Some but not bad at all (been overfeeding I think)
Cal: 430 ppm
Alk: 8.4 ppm
Mag: 1400 ppm

I do a ten gallon a week water change. I run GFO and Rox carbon. All of the equipment has been the same and nothing has changed other than adding some new corals as previously stated.

Last week, one of my cleaner shrimp went missing and I have not seen him since. Earlier this week, one of my blood shrimp went missing. Tonight, my daughter called me at work to say the peppermint shrimp was missing and it appears one of the cleaner shrimp was eating the head of the peppermint shrimp and the wellso coral was eating what looked like the missing blood shrimp. Not sure if it was their molting skin or not. All of the fish and all of the corals are open and fine.

Questions:
1. Could the crabs or the starfish be eating the shrimp? If so, can I remove them and still have a stable tank just using snails for a clean up crew?
2. Could the rock anemone be eating them?
3. If not any of the above, what is going on?

Any help would be appreciated. Thanks.
 
A mantis would go after crabs, snails, and such before shrimp.

By harlequin starfish are you referring to a serpent star?
 
If the crab gets big enough they can and will go for shrimp occasionally. My red Emerald crab has more than tripled in size since I got him and I can see him at night chasing my janitor shrimp, most of the time they are too quick for him, but of the 6 I added I can only see 3-4 at any one time now.

This weekend the crab goes in the fuge.
 
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