thank you, kind fellow enthusiasts
This tank did not have any troubles from the very first day.
The best advice here is to be patient, not panic and have an open mind. I tolerate all kinds of thing in the tank people normally abhor: snails, hydras etc. After all, it is designed to be as natural as possible, right?
The Sun is the main driver of this system. The fun is to see what the "organism" is going to develop into without me trying to control it.
I also have a 5 gal tank which sits right on the sunny windowsill. I did it on purpose just to see what it would do. After a whole month of blooming algae it completely cleared; and I made an effort not to interfere. Now I don't even have algae on the glass: I guess the snails take care of that.
I don't know, I like it lo-fi, and I wish people would just leave Nature do what it does best.
this is the same tank a few months ago, before I got rid of 2 huge amazon swords