SLC Flyfishing
Fish Crazy
You should be fine doing what you plan! However, cycling the new tank with the oscar in will be difficult. you really need to have a fish in that if it were to die from ammonia, you would be ok. to cycle this tank it's going to take a while anyway, but much longer if you have to keep changing the water and taking out the ammonia, just to keep your fish alive. It may take much longer than you might think, just be aware of that, and also you should be constantly testing the water to make sure it's cycling properly.