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Any ideas what this is. Find in my tank yesterday. Have not added anything to my tank since oct. First thought was aptasia. Closer look makes it look like urchin. But have also been told maybe a hyoid stage jelly. Any help please.

i was cleaning my tank yesterday and noticed something new on the glass i have not seen before. i have not added anything to my tank in about 4 months some at a loss. all i have in my tank (when i noticed it) is a tuxedo urchin 3 nassari snails, a bumble bee snail one large turbo snail, 2 blue...