Jmunroe
Aquarium Advice FINatic
Having kept many oscars over the years, I can tell you that the tank will be full in no the with one Oscar. It will grow quick and fill it fast. With just an adult Oscar in that tank your going to need a couple smaller water changes of 50% a week, or 1 large water change of 80-90% to keep the water ok. I have one adult Oscar and a small male Honduran red point in my 125 and when not doing heavy feedings the tank still requires a couple small WC's a week or one large one.
