I have a 55 gallon tank right now...I plan on getting a bigger tank later. Because I have 3 oscars about 2 inches each, a 2 inch black tiped shark and a 3 inch pleco....I have a Top Fin 60 filter...do I need a bio-wheel filter also? I read that they are better for oscars. And it would be ok to have both right?....I've been looking into getting a Emperor Bio-wheel filter? Good option? Any advice would be great! Thanks