Guppies breed easily — almost too easily.

Guppies are livebearers — keep males and females together and you'll have fry within weeks, no special setup needed. One trio quickly becomes dozens.
Adult guppies eat their own babies. Add dense plants like java moss or a breeding box so fry can hide, and they'll survive to grow out.
Because they breed so fast, plan ahead: keep only males to avoid breeding, give away extras to your fish store, or let nature thin them in a community tank.
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