Hey, I have just got 2 oscar fish for my 75-gallon aquarium. One albino tiger and One tiger. When I did research online and when I went to a local fish store there were a lot of differing opinions on whether or not this will work long term. I plan to add oxygen pumps as they get older. It may help to know that I have more than sufficient aquarium filtration for these guys long term as I have an Eheim 2215 and an Aquaclear 110.