It's a hitchhiker on the bottom of an Acan colony. Color showed up within the last 24 hours, prior to that it was all clear with tiny yellow dots all over. No tentacles or other surface features and it hasn't moved.
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At first glance it almost looks like some sort of nudibranch in a cocoon.

kinda what I thought at first but...At first glance it almost looks like some sort of nudibranch in a cocoon.
Im curious if its attached.
reminds me of one of these
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but very unlikely
Looks a lot like that.....what is it??
Looks a lot like that.....what is it??
The Atlantic Portuguese man o' war, also known as the man-of-war, blue bottle, or floating terror, is a marine hydrozoan of the family Physaliidae found in the Atlantic Ocean, as well as the Indian and Pacific Oceans. Wikipedia
Could it be a tunicate?
Something like a Corella species.

