I've never had one but I now they reach decent size (I've heard 18 inches) so I say a minimum of 180. I presume they're hardy considering how many my lfs sells, however I have yet to see one I deem very healthy, often times they have a extremely thin torso because my lfs feeds theirs flake not mysis or similar. If you have a large enough tank and find a healthy specimen by all means go for it. They're very unique little guys and like puffers have their own personalities
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