Clam? What is it and is it bad?

[QuentinSaltwater]

So I did a big water change after resetting my tank, and I moved around the rocks a bit. Later on, I noticed this little thing moving around in my tank, is it a clam? Here is a photo? This is the first time i've seen this thing in my tank which is about 8 weeks new. Is it bad, or is it ok? Pls let me know. Thanks!

 

[ISpeakForTheSeas]

It's a bit hard for me to see, but maybe a Heart Cockle (Corculum cardissa)? If so, definitely a good guy (I can't think of any bad bivalves, but maybe someone else can), and that would actually be really cool, as - similar to Giant Clams (Tridacna genus) - they're photosynthetic.

 

[Reefing102]

Hard to tell but appears to be. Most smaller bivalves in my experience have been more filter feeders than photosynthetic but there’s many species. As mentioned, I can’t think of any that are bad for a tank and they usually come in on the live rock

 

[ISpeakForTheSeas]

Hard to tell but appears to be. Most smaller bivalves in my experience have been more filter feeders than photosynthetic but there’s many species. As mentioned, I can’t think of any that are bad for a tank and they usually come in on the live rock

Most bivalves are filter feeders. Heart Cockles and Giant Clams are actually very unique in being photosynthetic (they are both photosynthetic using the same mechanism of symbiotic zooxanthellae).

 

[Reefing102]

Most bivalves are filter feeders. Heart Cockles and Giant Clams are actually very unique in being photosynthetic (they are both photosynthetic using the same mechanism of symbiotic zooxanthellae).

Interesting. Learn something new everyday.

 

[QuentinSaltwater]

Ok, thanks good to know!