Dear Yanbbrox, yes as you said, I have read lots of ways about how to keep a pond, everybody has his own way and some people are too much kneen on the details. But I know very old abandoned houses with a small pond and kois in them, they help them selves

)
I also got the necessary equipment but first I am more interested to see how it goes on according to the rules of the nature so if I could find the right way.
But the rains are going to stop in short and the temp will rise. Will be in alert.
Thanks