I don't have figure 8 but 2 green spot puffers that migrate to my Reef tank sooner and will house with my porcupine. Green spot, when they are babies, mostly will be brackish water, then they can fully saltwater when adult
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www.thepufferforum " is the good place to start as I learn all about puffers from there.. There is many brackish, fresh water and saltwater puffer fans over there that got many years of puffer experience.