Last not least update:
one day I will try Arnos tanks!
Now I use since quite some time Artemio and the four sieves: 0,240 mm, 0,200mm, 0,150mm and 0,100mm.
The best results I find when I empty the Artemio after about 24 hours.
Then the sieve method works quite well.
When I wait 36 hours, the naupliae begin to grow as large as the eggs and are difficult to be separated with the sieves.
After several sieving passes in the 0,100 mm sieve are found sometimes very small naupliae. Astonishing is that during the first sieve pass I find in the 0,100 mm sieve eggs or parts of eggs.
So my sieving method isn’t ideal, but works quite good.
And I guess, because not many people are looking at the naupliae with magnifying glass, generations of Paros have survived with getting also athemia eggs as food….