can anyone tell me what this is??

krickens

Reefing newb
hello i hope you see the pix im not sure if it is showing just got win 7 ..lol well anyway this is a hard shell looking thing that is white and it looks kind of like a moon flower but it also looks like something is inside like a type of worm maybe but it doesn't come out it looks really nice but im not sure if it is harmful to my tank any help would be great. thank you

kris




C:\Users\jrom\Pictures\fishtank\144.JPG
 

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