mollusk hitchhiker ID please

turfgrass

Non-member
Awhile back I noticed this little shell thing and since then it has grown. I first noticed it on the sandbed and then it kept moving around. Last week when I lifted some base rock to do a cleaning it saw it upside down stuck to a rock. The section of rock was 4" above the bottom sandbed. It must have climbed up the rock and found a good spot. I have it in a piece of egg crate for photo purposes, but I think it needs to get back to a dark spot.

Would like to know what it is and if many can be kept to help purify water? The shell it blue and white and opens about 1/8" wide. Thanks.
 
turfgrass said:
Are there known clam/mollusk that are kept for water purification? Thanks.
I thought all bi'valve mollusks cleaned the water, but I'm new at this so I'm probably wrong.
 
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