Who is eating my shrimp?

goosey

New Member
I have a 2 year old 50 gallon, slowly developing reef tank with 100# live rock. I added 30# of lace rock a few months ago in an effort rearrange territories and decrease the aggression of the strawberry gramma toward my new fish (3 chromis & blue hippo)- worked like a charm. At the same time I added a fire shrimp who had shed during shipment. He seemed to handle acclimation, but was gone by the next morning. I figured you shouldn't go to war without your armour and called it bad luck.
Recently added another fire shrimp and 5 peppermint shrimp. All were gone by morning without evidence. They were drip acclimated over 3 hours and water parameters have been steady (SG 1.023, ph 8.0, Alk low- alway fighting this, Nitrates <10, Nitrites 0.25, Phospates 0). I change 15% water split in 2 changes per week and my numbers have stayed the same for 2+ years no matter what I do.
Current stock: 1 CBS, 2 emerald crabs, many hermits & snails, 2 brittle stars, 2 false perculas, 2 green chromis, 1 strawberry gramma, 1 blue hippo, rock anenome, bubble tip anenome, mushrooms, ricordea, zoos and yellow polyps.
From what I have read, I am suspiscious that the CBS is the culprit. What about the brittle stars? I just lost a green chromis yesterday. He was absolutely normal the night before and I have not witnessed fish on fish aggression. Is someone getting meat hungry?
I would love to get a variety of shrimp and need to get rid of the sushi eater.
 

btldreef

Moderator
It's probably your CBS. I've heard a lot of problems keeping these guys with small fish and other shrimp. Some people have luck, but the larger majority don't. IMO, a CBS in less than a 90G isn't good with other shrimp.
What type of brittle stars do you have and what size are they? If they're green, this could be the culprit as well. Or if they're really large.
 

bang guy

Moderator
How long has it been? If it's only been a couple of days they may still be around.
Cleaner Shrimp are often stressed when placed in a new environment. Stressed Shrimp usually molt like if you lower salinity suddenly or add Iodine, it will stress them and they will molt.
A molting Shrimp will do its best to hide for a few days. A molting shrimp is also fair game for a large, mature CBS.
 

goosey

New Member
It has been several weeks - I was hoping they were hiding too.
My brittle stars are dark brown. One is about 4" diameter and the other is propably 7 or 8" (he's so big he's creepy). I like to have them around to clean up. I don't want to keep sacrificing shrimp, but I am inclined to give away the CBS and see what happens with the stars. Sound fair?
 

btldreef

Moderator
Originally Posted by Goosey
http:///forum/post/3158267
It has been several weeks - I was hoping they were hiding too.
My brittle stars are dark brown. One is about 4" diameter and the other is propably 7 or 8" (he's so big he's creepy). I like to have them around to clean up. I don't want to keep sacrificing shrimp, but I am inclined to give away the CBS and see what happens with the stars. Sound fair?
Do you have a QT tank you could place the CBS in for awhile?
It's the CBS or your HUGE brittle star. I get rid of mine when they get that big, since no matter how much I feed them, they prefer $50 fish....
 

goosey

New Member
Sounds like QT will be the best option to figure out who the culprit is. Thanks for the help!
 
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