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From The Aquarium Wiki

Umbridae, or Mudminnows, belong to the order Esociformes. There are 3 genera and 7 species in this family.

	Common name	Difficulty	Maximum Size	Minimum Tank Size
Umbra pygmea	Eastern Mudminnow	Challenging	4.72440944881894.724 in12 cm	3535 gal132.489 liters 132,489.412 mL