Hitchhiker ID Please

Reef by Steele, Pods Starting @ $19
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Hi can someone tell me what this white thing is under my acan? The acan shrinked when I scraped the glass nearby and then I noticed this for the first time. Should I remove or let it be? Thanks

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Crabs McJones

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Pineapple Sponges. Harmless filter feeders
 

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