Susan if your salinity is 24 ppt that is why your shrimp are dead. It should be more like
34 ppt not 24 ppt. Shrimp molt and a salinity that low will mess up their osmoregualtion
big time.

--
Boomer

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"Susan" wrote in message
...
:I hope someone out there can give me an idea what's going on in my tank. I
: have a 29 gallon reef/fish tank with approx.15-20 lbs live rock. It's been
: set up for about 10 months. After I had it set up I bought a pepperment
: shrimp who got big and was thriving. I found him dead recently in my tank
: with no apparent injury. I rubbed it off that he was old. I since had
: purchased 2 cleaner shrimps at different times and lost both of them within
: a week after buying each of them. Again no apparent injury. Salinity is 24,
: PH 8.0, no nitrites or ammonia. Nitrates around 60.(It's always been around
: this point since setting it up) I added a few corals to the tank a month or
: so ago. I have a damsel, 2 clown fish, clown goby, 2 crabs and a turbo
: snail that have lived in the tank a long time and doing well. The guy at
: the pet store thought maybe it was a mantis shrimp killing them. I haven't
: seen any in my tank and assume they would eat the shrimp if they did kill
: them?? Anybody have any ideas what is killing off the shrimps?
:
: Thanks--Susan
:
: