Anyone's Zoas ever do this?

Blitzkid

New member
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My Gobstopers seem to be spewing black stuff
 
That's zooxanthellae.
If you added new lights that could be bleaching. Same thing if you just introduced them into the tank. Light shock could provoke that.
High temperatures are also known to lead to that, again as bleaching.

If you didn't change your lights, or if you didn't just introduced the polyps to your tank, you don't have to worry. Those PEs do that from time to time. Make sure the temp isn't too high!

Grandis.
 
No problem. Make sure they don't do that all the time.
Watch them closely because you just changed the bulbs.

Grandis.
 
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