g'morning Charmaine
Most likely as you said, the original Oscar is just showing the new one who is boss of the tank. I have just done the same thing with my one juvi Jack Dempsey. He had been solo in the tank and I decided to get another one for the company. Well, Jackie whom I know now is really a Jack... chased Jill all over the place but after three days they have settled in. Tho Jack still chases Jill around at times now I find Jill not backing down anymore and still goes and follows Jack around. I think they will do fine.
Your original Oscar just has to accept the new fish into his territory. From what I hear they should be fine together. I know that Shawnie has a few Oscars and hopefully she will be along to give you a hand and maybe be able to help you ID the gender for you.
Good luck with your Oscar, they were my second choice for companion to my JD. They sure are great fish!
