Update some time later, with some nice population :)
20 emperor tetra (and 5 babies in the net, I found them hidden in the java moss when I removed the tetras from their holding tank)
12 corydoras Julii
10 otocinclus
12 adult red cherry shrimp and an unspecified amount of babies
1.5mm long thing that sort of looks like... A mussel? It has a shell and it sticks to things, does not seem to move, at first I thought them baby snails but the shell is flat.. Like a one-sided clam.. there are a few dozens in my tank now...