No, they arent penguin tetras. Penguin tetras don't have a coloured tail and their black stripe curves down their tail. They look a lot more like black neon tetras but black neons don't have red tails.
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Kevin's Tanks
10 gallon tank - 2 adult guppies-1 female 1 male-10 1 week old guppy fry,
10 gallon tank-nothing
24 gallon-
5x neon tetras-3x otocinclus, 3x albino cories
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