This is our aquarium. As of about a week ago, we had 5 male platies (those red fish), 6 neon tetras, a chinese sucker fish, and two male guppies. We only have male fish so they don't mate and make babies. The tetras are not live bearers so I guess that means it doesn't matter what sex they are.
Then, last friday, we discovered this:
That small orangeish blob to the right of the bottom black part of the heater is a baby fish, a fry. We did not put it in there. And there are at least 4 more. Upon closer examination, one of the guppies is obviously a female.
So basically, our two guppies were in the aquarium making babies, and I saw one of the babies, and the baby looked at me!