simulating a wet and dry season?

We are not almighty as your name suggests, Almighty Joshaeus. 7 Zwerge rightly reminds us of the great differences between a twenty liters tank with still waters and a constantly running stream in the dwindling primeval forests of south-east Asia. However, there is one thing that is used by the good breeders: Changing food, suddenly abundant. If you want to instigate a pair to breed, then you organize a big water change in combination with a change in feeding: suddenly there are microrganisms for future larvae and young abundantly around (if you provide them!) and good numbers of good food for the adults. This seems to trigger some reluctant pairs to breed.
And what is the background? It’s just the beginning of the wet season with lots of rain water and an explosion of infusoriae and other small food. By this you imitate something. But it’s limited to a still water tank of twenty liters. Nevertheless, you can do it and by this you apply your knowledge.

Hi!
The best organic material are nettles. Not too much in a small bucket.
I would never ! take all the stuff through a net, you will get too much rubbish with.
No, the mosquito larvaes need to breath air, therefore they come to the water surface. I take a bucket with fresh water with me and an anthemia sieve. When I see the larvaes hanging under the water surface, I make a quick movement with the sieve through the water at the surface. Then I get them and put them in the fresh water bucket.
Than I wait a moment for the remaining larvaes in the “old water balcony bucket” to come again to the surface and the same procedure again.
When I have caught enough for the moment, I take the fresh water bucket to the bathroom and pour the water through the sieve. Than I wash the larves under the moving water in the sieve. Then I feed them to my fish.