Iv currently had my Oscar for about 2 months when I got him he was about 2.5 inches and now he’s barely touching 3 inches some of my family say he doesn’t even look any bigger, my question is why? I feed him bio gold pellets everyday, freeze dried krill some days and frozen brine shrimp every now and then I do a 50% water change every week nitrates never go above 5ppm maybe I just have a slow grower or should I be feeding more?