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I think it's new because this is the first scientific paper which actually reports it officially
Rather than me saying "Dude! There's like, these sharks, and they like, show up everyday. It's cool."
and the cleaner fish is like "whoa, big mofo shark is totally gonna eat my ass FML!!!!"
and the shark's like "totally not, little dude LMAO BTW I'm like totally lost!"
so the cleaner fish is kinda "well IMHO, you could just hang and I'll like clean your gills and ****. That cool, big guy?"
and the shark's like "DUDE! We could be like totally symbiotic! That'd be waaayyyy cool!"
Edit. I have a report to write by the end of the day, and I have decided to include the words "cleaner", "fish", "shark" and "symbiotic" in it.