Hi Rafael,
These things can happen – if he had really gone, I can help with a new male for your ladies. But I’m not entirely convinced….they are such perfect in hiding. If you do not empty your tank from all leaves, caves, roots etc. and have only inside the sand and the fish and the mudd is again layng on the ground you can’t be sure that he isn’t hiding somewhere….you look under one leaf and he slips under the next and stays motionless ….
Sometimes I am sure that only three of my Spaerichtys selatanensis are left … They are bigger than the Paros and the tank is just 25x25x100cm …. Next time I see all the six fish again …
And your Bettas I also see very rare times – the male I think I saw some days ago under a swimming plant and the female I saw today under the moss in the front of the tank when I was looking for them which my torch …
And when Bernd asked about if there were any phoenicurus offspring and I searched in my tank 25x25x40 for the adult fish, I just found one female and some offspring. but I didn’t empty out all the “tank decoration” ….