Oh crap!! What does this mean for my new tank?! It says it's a free swimming parasite that doesn't require a host. Do I need to break down the aquarium? What to do with live rock and corals??
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Uronema Marinum
Identifying this uncommon disease is fairly simple. It almost exclusively infects Chromis, although it may appear in other damsels and clownfish as well. Outside of these, it is incredibly rare to see Uronema on other species. It presents itself as a red lesion or sore on the fish’s body. It is a free-swimming parasite and requires no host, so the fish can never be returned to the infected tank, and all of the Chromis should be removed due to the risk of infection. To treat the fish, remove him immediately as the disease spends incredibly fast. In a quarantine tank, treat his food with a binder and Metronidazole. Now, treat the quarantine tank with Metronidazole, acriflavine, chloroquine phosphate, or copper. If one does not seem to be working, switch to a different medication after using carbon to remove the old treatment. It can be tricky to cure once there is external damage."
https://www.algaebarn.com/blog/intermediate/uncommon-saltwater-diseases-and-infections/#:~:text=Uronema Marinum&text=It presents itself as a,to the risk of infection.