I have no idea this is....

[Pngdave]

It looks cool though at night, the tentacles have little glowing ends under blue light


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[Pngdave]

And this.......


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[Sniperhank]

A receding and dying off galaxea coral and then dying off favia brain coral as it appears they do not share walls between each other (if they share a wall it is a favite).

[mr_X]

It's old death though....nothing recent.