Only one male Potamotrygon left... he killed the 2 females by harassing them back in 2012... I bought a new female (always P. leopoldi) and he killed her when she got 18-20 months old (early 2014)... I tried again, with a 5 years old female, bigger than him... it worked during 1.5 years, with 2 spawning (each time 4 pups) and during the 3rd pregnancy, he killed her again (2015)... I had a 5th female (P. motoro) he was with during 2.5 years, until she became mature... and then... I let you guess... yeah ! he killed her (April 2016)...
I have enough with this bastard... I stopped trying... he will stay there alone till... who knows ?