Clam?

[Saaqib_Ansari]

Just did some rescaping and flipped one of the rocks over to see what looks like a clam? Wasn’t there before is it good or bad and how did it even get there

thanks in advance

 

[35ppt]

Redacted

 

[DeniseAndy]

It is fine. I have a few of them. Filter feeders. Good to have all the cool creatures.