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Are you asking about the things with shells that appear to bivalves of some kind? Because it looks to me like a couple of bivalves with the mouth/mouths (the fleshy parts) circled.
If not, you may need some clearer pics for an ID.
No - they shouldn't cause any issues at all.Bivalves. Look ideal. Will the end up harming the torch that they are growing on. Meaning stressing them out til death