Can anybody tell me what these are please

amber3cat

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I just noticed these on my glass sorry about the quality of photo it's the best I could get
IMG_1613.JPG
IMG_1606.JPG
IMG_1607.JPG
 

AK47

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I had these once, was told they are spirorbids.
Didn't give me any problems, upgraded tank and haven't seen any yet though.
 

High pressure shells: Do you look for signs of stress in the invertebrates in your reef tank?

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