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From The Aquarium Wiki

Atherinidae, or Old World Silversides, belong to the order Atheriniformes. It consists of about 165 species in 25 genera, occurring worldwide in tropical and temperate waters. About 2/3 of the species are marine, and the remainder live in fresh water.

	Common name	Difficulty	Maximum Size	Minimum Tank Size
Craterocephalus stercusmuscarum	Fly-Speckled Hardyhead Tawny Hardyhead Unspecked Hardyhead	Challenging	44 in10.16 cm	3535 gal132.489 liters 132,489.412 mL