Clams Dying!!! Please Help!!!

[swimboy123]

Hello everyone, here's the situation:

I had 8 tridacnid clams in my 300 reef tank. 3 Croceas, 2 Derasas, 1 Squamosa, 1Hippopus, and 1 Maxima. All of these specimens had been in my care for anywhere from 6 months(Maxima) to almost 3 years (Squamosa). In the last 6 weeks, all the Croceas, the Hippopus, and the Maxima have died. Mantles have been pulled in, and sometimes they didn't open for days.
The thing that I don't understand is why. Lighting hasn't been changed. All tank parameters are in normal ranges and have not fluctuated at all. No new tank hardware, livestock additions, or even temperature fluctuations have occured at all. Furthermore, the Derasa's and the Squamosa have actually started to flourish.
I have sat at my tank long into the night to see if anything is parasitic or taking a bite out of them and haven't found anything.
ANybody have any ideas? Please help me before the rest of my clams perish!!!

 

[mbbuna]

can you list all results from every test kit you have, also list fish, shrimp and crabs, what you feed, how often, how do you maintain Ca/Alk, how you dose it and list any other additives you use and filtration media

 

[swimboy123]

sg 1.026
Nit- 3
Amm-0
phos-und
calc-475 or so
dkh-12

Dual chamber calcium reactor, kalk reactor, tank is majority sps with a couple leathers and xenia.

Feed with phytoplex, zooplex, and DT's. Fish are feed frozen food 2x weekly, flake every other day. no other additives

livestock- 3 hippo tangs, 1 purple tang, 1 kole tang, 2 true perc, 1 vlamingi tang, 3 orange anthias, 1 sixline wrasse, 1 mandarin goby, 1 pajama cardinal, 4 green chromis, 2 scooter blennies, 1 reef butterfly, 3 queen conchs, 6-8 emerald crabs, ton of hermits, ton of snails

 

[mbbuna]

do you know the names of the snails you have? some snails sold as safe nassarius snails are actually predatory whelks.

 

[Rovert]

Uh, huh. Aliens.

http://www.reefcentral.com/forums/showthread.php?threadid=1118474

 

[swimboy123]

all turbo and astrea snails with only a few nassarius snails. What are the defining characteristics of the predatory whelks?

 

[a4twenty]

<a href=showthread.php?s=&postid=9924573#post9924573 target=_blank>Originally posted</a> by swimboy123
all turbo and astrea snails with only a few nassarius snails. What are the defining characteristics of the predatory whelks?

this should help id them

 

[Kalkbreath]

Many of the things that bother clams need Iron to multiply. (Vibrio and Perkinsus to name a few)
Its always a good idea to limit iron in a reef tank with clams.
With out pointing fingers , there are a number of reef additives which contain boosted Iron levels.

 

[swimboy123]

point fingers man. Let everyone know

 

[swimboy123]

Well spent two hours last night checking my remaining clams. Pulled each one out and checked over them with a flashlight and a pair a tweezers. Didn't find anything that matched the description of pyramid snails, but my clams did let me know that they were ****ed I woke them up by squirting me in the face twice.