Help with Acan

ReefNoctas

New member
Hi all. I've had this coral for almost a year now, and recently (little before last week) it started showing some kind of hole on the side. At first I thought it was a new mouth, as it was eating happily (ReefRoids), so I let it be. But then I started looking for pictures of Acanthastrea propagating (as it was sold to me as Acanthastrea), and realised it's too big. Maybe it's an Acanthophyllia"¦ Which means it could be some kind of necrosis instead. What do you think? Acanthastrea or Acanthophyllia? Propagation or injury?
Params:
Nitrate: 6-8ppm
Phosp: 0 (old test, new one coming in the mail"¦)
Ca: 420
Mg: 1350
Kh: 9.2
 

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