Weird thing on blasto

[khmer_reefer]

Hey, I notice this weird thing on my blasto a few weeks ago. I was wondering if anyone of you know what it is (circle in red). It closes up when I touch it and then open back up again. Is this thing good or bad? If it is bad how do I remove it?

 

[ScottR]

It’s a bivalve. I wouldn’t worry about it. It won’t bother anything.

 

[khmer_reefer]

It’s a bivalve. I wouldn’t worry about it. It won’t bother anything.

Thanks for the quick response.