But what I just went thru, the past month, and looking back, six months, has really blown my mind.
I had 3 clams eight months ago and moved them into my upgraded 20 gallon with metal halide. Those 3 had been with me, more or less, since Jan 2010.
Within first 2 months of this super expensive ultimate clam set-up, I was losing snails at a rate of two per week and my oldest clam died. He had new white growth, and was almost 2 years old. Beyond testing the water, and finding all normal, I did not know what to think.
Month later...added a 4th clam (back to 3). He dies within a week. Snails keep dying too.
Coincidentally, we assumed this clam died by hermit crab, because this is also when we caught a hermit chewing on another clam (that clam lived). Count now at 2, and 2 gone.
One nite lites out we catch a HUGE flatworm (2 inches +) on back wall of tank. We assume this is what was eating snails. This is end of July. 2 clams left fine, tank fine, snails stopped dying.
Flash forward to October 2011 and the picture I have on my profile. I have two clams left, and get a third. This makes 5 total in the new tank.
Two weeks later, one clam dead...seems eaten. This is the clam that survived the hermit attack, so we know he was healthy. Two weeks after that, another clam dead. Dead snails start to appear again. And this weekend, last clam dies. I took it out right away, same as others, white shell, mantle intact, eaten from within. no guts.
Put clam in a little dish. Later I came back, guess what is crawling out of clam...another HUGE flatworm. I research online and what do you know? Very common tridacna predator. Known to wipe out matriculture lagoons.
Obviously I cannot have clams in my new tank, which I set up just to raise clams, until I know there are no more worms.
Beyond letting any worms left eat all my snails, and then starve, and watching at night for next many months, what else can I do? I am soooo sad. Have had clams for almost 2 years now and to have 5 wiped out in 6 months well I feel terrible. Must have come in on new live rock.