If the guppy was young when you got it, the dark coloration could be normal. When half-black guppies (that's the variety you have) are born, they usually have yellow or light coloration. As they age, they develop darker, black coloration on their bodies, mostly on the back half.
Good luck!
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"Science demands something else--that we shall transmit to posterity a less perishable inheritance." Alfred Newton
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