I recently upgraded my Oscar tank from my 55 to a 125 long. He is around 6" and so is my pleco. I added a jack Dempsey, a green terror, and a flower horn, all around 3. The Oscar is def the boss. And aslong as the others stay away the jd's cave, It's actually a peaceful tank. My question is when these guys grow up will my fluval fx5 be good enough filtration?