I hate to be "that guy", but that tank setup is not going to work long term. what you have is a 44 gallon tank, smaller that the recomended size for one adult oscar (55 gallons). I imagine you have a hard time keeping your nitrates under 40 ppm, even if your doing 2 huge water changes a week. Your oscars will eventually get sick, probably HITH, from poor water conditions. I feel like I should tell you now, cause when I first got my O I had him in sub parr conitions and he got HITH, and it got worse before it got better. It took months of almost daily water changes before I was able to get it under control. You might want to start thinking about upgrading to at least a 100 gallon tank, to avoid this problem.