My new Full Grown Green Spotted Puffers are insane! These Pufferfish attack fish, crabs, crayfish and anything else I feed them. While being a nano fish they are the most aggressive species of pufferfish. Green Spotted Puffers can live in freshwater, brackish, or saltwater but they thrive in a salinity from 1.005 -1.025. I keep mine at 1.015