ID this alien please

Trefaca

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Hello everyone, can somebody id this I have seen it last night and it was two times smaller and only yellow and orange colours now that it popped out out of nowhere it has green part. I have no idea what it is and it's completely out of sand and when blue lights are on its very bright on colouration.

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Trefaca

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I do have one torch and one hammer coral but none of them have any yellows on it they're just green and blue. I was thinking if it could be that but wasn't sure and if it is should I remove it?
 
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Trefaca

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That's it under blue light.
 

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