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If the white spikes jutting out there are part of the shell, then it's likely either a Jewel Box Clam (taxonomic family Chamidae) or a Thorny Oyster (Spondylus genus) - neat and harmless.
Yes they are part of the shell. Thanks. But it appeared out of nowhere. And actually I've only had occupants in the tank for roughly 6 weeks. Had a few pieces of live rock but mostly dry rock cycling for about 2 months before that. Could it have been very tiny in the LR that I never noticed it? I'm not sure how a clam begins its lifeIf the white spikes jutting out there are part of the shell, then it's likely either a Jewel Box Clam (taxonomic family Chamidae) or a Thorny Oyster (Spondylus genus) - neat and harmless.
It's possible it was tiny and unnoticed; some bivalves are also mobile/facultatively mobile at some periods of their lives, so it's possible it moved as well.Yes they are part of the shell. Thanks. But it appeared out of nowhere. And actually I've only had occupants in the tank for roughly 6 weeks. Had a few pieces of live rock but mostly dry rock cycling for about 2 months before that. Could it have been very tiny in the LR that I never noticed it? I'm not sure how a clam begins its life![]()

