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From The Aquarium Wiki

Ostraciidae, or Boxfish, belong to the order Tetraodontiformes. They come in a variety of different colors, and are notable for the hexagonal or "honeycomb" patterns in their skin and skeletons. They swim in a rowing manner. There are 14 genera and 25 species in this family.

	Common name	Difficulty	Maximum Size	Minimum Tank Size
Lactoria cornuta	Longhorn Cowfish Longhorn Boxfish Yellow Boxfish	Difficult	2020 in50.8 cm	180180 gal681.374 liters 681,374.12 mL
Lactoria diaphana	Roundbelly Cowfish	Challenging	1212 in30.48 cm	7575 gal283.906 liters 283,905.884 mL