What is going on here with my Duncan?!

Can you post a pic? Your mp4 file's not working.
 
Can you post a pic? Your mp4 file's not working.
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Looks to me like it's expelling zooxanthellae. How long have you had the coral? Not long, I'm guessing.

Some corals, when they are stressed after a move to a new system, will expel zooxanthellae that aren't as beneficial in the new tank. Essentially, they are making room within their tissues for the better-adapted zooxanthellae to thrive. It looks okay other than that, IMO. I've had several corals do this after a move, and they usually come back stronger and healthier. Feed it, if you can, to ensure the coral has enough energy through this transition phase.
 
That only time I've seen the heads on my Duncan do that was when I let my salinity drop to low
 
It may not be getting enough light in that position/location.
 
I see mine do the same thing every once in a while, never been able to figure out what it was. Following.
 
No need to cut those parts off...they are just calcium carbonate now :) I was just wondering if you'd lost some heads or if you bought the coral that way. I think it looks okay. I found that my Duncan has shorter, fatter polyps in slower flow and longer, thinner extension in higher flow ares.
 
No need to cut those parts off...they are just calcium carbonate now :) I was just wondering if you'd lost some heads or if you bought the coral that way. I think it looks okay. I found that my Duncan has shorter, fatter polyps in slower flow and longer, thinner extension in higher flow ares.
Thanx! That makes sense it's definitely in a lower flow area now.
 

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