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Palythoa
Spotted in the Amsterdam zoo.
Glad to help @sttweets. Still not sure though of the exact species and will try to do some more research. Hope to find a similar one during our next dive weekend. Love your photo sets as well :-)
Other interesting reads :-)
http://www.reeflex.net/tiere/799_Protopa...
http://animal-world.com/encyclo/reef/zoa...