Weird growth

[Cole nelson]

So I have an all coral tank as of right now and out of the blue I noticed a strange growth behind my frogspawn. I don’t know weather this is dangerous or if it is some sort of coral. It is colored purple/blue with orange dots

 

[WV Reefer]

So I have an all coral tank as of right now and out of the blue I noticed a strange growth behind my frogspawn. I don’t know weather this is dangerous or if it is some sort of coral. It is colored purple/blue with orange dots
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Hard to tell from the pic..... look up sea squirt. They often have crazy colors and polka dots.