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Old 01-04-2018, 09:30 PM   #1
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Sponge, algae or egg sac?

These came on some live rock I purchased. It seems to be getting larger. It is a white blob with a smooth shiny surface.
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Can anyone ID it for me?
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Old 01-04-2018, 10:10 PM   #2
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Looks like a sponge
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Old 01-05-2018, 05:11 AM   #3
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Looks like a sponge also to me...
If you find a 'valve' on it , then may it might be a Tunicate...
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Old 01-05-2018, 08:20 AM   #4
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It is Cthulu. It will eventually develop tentacles and attempt world domination.

Or it's a sponge.
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Old 01-05-2018, 01:10 PM   #5
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Don't think its a sponge as it's shiny looking sponge usually dull looking
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