So I barely see my emerald crab and when I do it’s a small piece of her. And finally I caught her out her burrow and was able to snap a picture of the cotton ball on her “knee”? Was wondering if anyone knows what this is. I’m always staring into my tank so I always catch diseases early when and if they are any. Can someone tell if this is a disease, what type, and how to treat it?
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![7B39B13E-A7DD-43DC-8ECA-68B52C607A6A.jpeg 7B39B13E-A7DD-43DC-8ECA-68B52C607A6A.jpeg](https://www.reef2reef.com/data/attachments/2509/2509237-e0bff24ab33177b53ebe19218eece119.jpg)