Location
Queens
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My duncan coral's tentacles used to be somewhat long but over the last few months, they've slowly retreated and swelled up. They no longer look smooth but rather chunky. What can it be?
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hclaveria

Advanced Reefer
Location
Elmhurst, NY
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Have you changed anything? Lighting? Don't have too much experience with Duncans but most of my corals with tentacles go through cycles in which they extend and contract.

I would be more concerned if you changed something specific in the tank or if your water parameters changed suddenly.
 

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