hey there and welcome to OFL!
I bet you'll love this site, and let me start by asking if you could try to make use of some paragraphs and puncuation marks.
This would make long posts easier to read.
You will get better responses that way.
And Kanga-fish is correct.
We need to tell you that you'll need a bigger tank with sufficient filtration to keep your oscars happy and healthy .
Their growthrate will not and should not slow down for the first year the least.
We advice 55Gl per Oscar, with no tankmates that is.
Enjoy the site!