Bubble Coral or Bubble Algae?

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Phyl

Aquarium Advice Addict
Joined
Oct 30, 2004
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Location
NJ
I got this mostly dead piece of bubble coral from someone who was breaking down his tank (he threw it in the box with some other frags I was taking). The thing has been trying to open since I had it but it isn't doing so great. Then yesterday I noticed what I hope is new bubbles, but I have the sneaking suspicion that what's on this rock is actually bubble algae, not bubble coral.

TIA

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