Assertion: green puffer | /r/CapableOf | survive in freshwater
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text: When very small green spotted puffers can survive in freshwater, but once they grow more than 1.5-2" they need to be acclimated to brackish water (with an s.g. of about 1.008-1.0016), and when they're over 4.5" it's best to keep them at an s.g of 1.016-1.022 (or full marine conditions).