My oscar is around a year and a half old and only about 8.5 inches. I do enough water changes to keep the nitrates around 20 or lower my ph stays right around 7. Ammonia and nitrite is always zero. I keep the temperature at 27 degrees Celsius. I have an aqua clear 110 for filtration. The oscar lives on its own in a 75 gallon aquarium. I would give my oscar pellets but it’ll go several days without eating them and even when it does it’ll only be a couple. Therefore I give it a mixture of vegetables such as broccolI and cauliflower as well as omega one foods such as blood worms, shrimp, brine shrimp, and tubifex. Any tips would be greatly appreciated.