Its pretty amazing actually. My son inlaw got 2 oscars at the same time that I did.
After maybe 3 months mine are at least 3 times bigger. His are feeding on blood worms mine on the poor little guppies
Dont worry its all over very quickly ) I just dont want to waste them by them dying before they visit the oscar tank.
And I love guppys, but i no it would happen in nature, so I should stop being soft, just raise your ph but I don't no how you do it as I have never messed with my ph, heard of ph adhjusters and thats about it.