Not an easy one..

tezaman

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its there about a month , it was way smaller , now its starts to multiply the heads , and they got a shape too.
what is this , some kind of egg, or coral?

1.jpg 2.jpg
 

ISpeakForTheSeas

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Is the white tube connected to the little pile there? If so, it reminds me of the thread below, and is likely a tunicate (or sponge) of some kind. Those little eggs/heads in the pile may actually be eggs or new tunicates/sponges budding up.
 
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tezaman

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Not a Vermit snail.

Let me put some more clue's
 

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ISpeakForTheSeas

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Yeah, that looks like a tunicate of some kind to me (though I couldn't tell you if the "eggs" as the base are actually eggs - sexual reproduction - or buds - asexual reproduction). So, yeah, very similar to the one in the link I shared above (though almost certainly a different species).

Edit: to add, tunicates are generally harmless filter feeders, and yours don't look like the invasive kind, so I'd say to keep them/don't worry about them.
 

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