Went to the club auction on Sunday and ended up with a trio of Black Moscow Guppies. They are in a 10 gal heavily planted tank right now and I believe I will keep them there. Do they require some aquarium salt? Do they breed true? I have an LFS that will take extras in the future. Do you have to cull them or could you just separate males and females of unwanted young ones to prevent future breeding? I have plenty of tanks they could go into as dither fish. Or do culls if bred throw dark black Moscow guppys again like OEBT blondes do? Any help is appreciated.