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What are palys? What do they look like? Are they common in marine tanks?
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Palys and Zoa polyps are a type of mat coral that are pretty common.
http://www.zoanthids.com/
Note: Not suggesting to buy from that site or not to buy from that site, i have never bought from there, they just have lots of pictures of cool palys and zoas.
They are from the same order Zoantharia. Palytoxin is I believe found in many families under that order but more so under Sphenopidae (Which contains the genus Palythoa which is where the term "Paly" comes from).
Palys are typically larger and less uniform. They stand up higher. Zoas are typically more uniform and are squatter, but that isn't always true :-D