02-11-2013, 08:49 AM
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Yes, you need to add a Calcium suppliment to the tank for the Clams. They need this in order to grow. Without it, they will not survive. FW Clams are not the easiest to keep, as you must target feed them. And your water cannot be that clean, as they need "dirty water" to survive also. Meaning they need Nitrates to filter and grow also.
In any case, buying clams for your aquarium is a bad idea. Even if we were to assume that these “shark tooth clams” (the shell is shaped very much like a shark’s tooth) are truly freshwater clams, they don’t have much chance of survival in an aquarium. Clams are filter-feeders that pump water in and out, and filter out the particulates in it for food. In the wild, there are a lot of microorganisms and detritus in the water, and clams live on it; but in the aquarium, they starve. The water is just too clean for them.
There are other issues with keeping clams. One is that they dig. Some will dig out of sight within moments of being placed into your aquarium — never to be seen again. How much fun is that? A forum message regarding these “shark tooth clams” said that they were 5 to 6 inches in length. If you had plants, a clam that large probably won’t dig out of sight, but it will uproot your plants as it crawls around.
Another possible issue is reproduction.
There is one more issue with keeping clams or mussels in your aquarium. They need plenty of calcium to build their shells. Your water may not be hard enough for them to do so. The shell will soon become pitted and discolored as it dissolves away.
I highly recommend that you avoid keeping clams in your aquarium; they are destined to starve. Some people have success with clams in ponds. The water there is usually substantially dirtier and full of microorganisms. But there should be substrate so that the clams can dig safely away from any fish that might hound them.