Any id would be of great help

[chubbyhubby]

Hi seen this in my tank afew days ago thought it was part of rock. When checking tank tonight noticed it has moved. So any idear what this is and is it one of the good guys .

 

[Lionfish Lair]

It's probably a bivalve, like a cockle.

 

[chubbyhubby]

Ok is ot safe

 

[Lionfish Lair]

Yes, they are cool to have.