In March of last year my sun corals did something similar. Whatever it was, I nearly lost all 3 colonies but they have recovered nicely, and are re-growing well.
Great photos! I just got an orange sun coral yesterday. The polyps are opening up nicely and happily taking pieces of shrimp. I think it might be my favorite coral that I have in the tank.
last Saturday I could observe like some tubastreas started spawning, from what immediately pocket some of them in order to preserve the eggs to take them to the refuge.
Thanks! They're actually a lot blacker than that pic loooks. I have seen the green ones too. My roommate actually just picked a nice little colony up but they haven't started opening regularly to eat. Slowly but surely though!
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