arking_mark June 4, 2020 Share June 4, 2020 Is that black thing a muscle or some sort of clam? Link to comment Share on other sites More sharing options...
sethsolomon June 4, 2020 Share June 4, 2020 maybe a keyhole limpet or a black sponge? Link to comment Share on other sites More sharing options...
arking_mark June 4, 2020 Author Share June 4, 2020 I don't think its a keyhole limped or black sponge. It looks like it has a clam like mantle. If it wasn't so hard, I'd pull the rock up for a closer look. Link to comment Share on other sites More sharing options...
elbowdeep88 June 5, 2020 Share June 5, 2020 So a limpet will move around the tank right? And a clam/mussel will close/retract if poked? A sponge will do neither. Link to comment Share on other sites More sharing options...
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