Spend quite some time to find this one but through another Corydoras ID-photo you brought me on the right track animal_expert01, it seem to be Corydoras mealnotaenia, thanks !
?????? Animal_expert01 said Corydoras aeneus, not Corydoras melanotaenia. So, he said just exactly the same that I said already at the begin of the photo.
Animal_expert01 identified another Corydoras-photo from me and by checking out that one I found a picture resembling this species so in that way he helped me - even by giving the "wrong ID" for this one, identifiing the species on this picture .
Ah, now it's clear (I've seen the other photo in recently commented photos, after my last comment in this one). Thanks for explanation