Don't feel stupid, you can't be expected to know what you don't know. There are two big categories, freshwater and saltwater (brackish falls in between as having some marine salt but not fully saltwater). Freshwater has two general categories of coldwater and tropical.
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Tina
Puffers:
Auriglobus silus x2
Colomesus asellus x1
Tetraodon travancoricus x1
Tetraodon biocellatus x2
Tetraodon nigroviridis x1
Tetraodon baileyi x2
Tetraodon lineatus x1
Tetraodon palembangensis x1
The greatness of a nation and its moral progress can be judged by the way in which its animals are treated. - Mohandas Gandhi
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