Small fishes in my pool ...

I've just been in the corner of my office building yard, looking at a pool with some fishes in there. They were swimming naturally while picking something to eat from the bottom of the pool. Sometimes they got some food from the root of some plants flooding over it. View months ago there was no pool in the yard. But now, there is a living even some small fishes in a little bit of water, fishes with little mouths picking food that I just don't know where it is from. My friend and I've never given them pellets or whatsoever. But they can eat and alive, growing up day by day.

I wondered...
There is abundance of living for everyone who knows how to get it and then struggle for it. ***