Few weeks ago I tried breeding X-Rays but it has been unsuccessful (I ended up breeding snails )

So I put them back to the main tank.

Today, I did a water change and start to admire my fishes like anyone else.

Then I spotted a small USO (Unidentified Swimming Object) moving at my CO2 diffuser. I looked carefully and it's a fry!

I looked around to see if there are any other fries but I think that's the only one. Or maybe that's the first that hatched. I don't even know what fish is that.

Whatever it is, what can I do now?

It's pretty hard to catch them because they are swimming at the corner of my tank.

Any advise?