I took the video after a feeding (just threw in some extra food for the video), the stuff floating around is mostly duckweed that they splashed down when they hit the surface.
The tank is roughly 50g 3'x18"x22". I just run 1 simple sponge filter.
It looks like they have started breeding . Sorry for the terrible quality, I had to zoom in from the other side of the room; didn't want to disturb them.
You can see them balling up in the top left corner.
Wish me luck.