I have 2 HOB filters on my 90. My stock is one 9" oskar, 12" tiretrack eel, 3" green terror. One of the filters is an aqua tech and the other is a tetra. They came free with my old 55 and I transferred them to my90. They're each rated for 60 gallons. I feel that they are doing a poor job as the water is not that clean and there's not much flow from one of them. Even though it's cleaned weekly. I'm considering either getting two new HOB filters thosye AC110s? Or Emperor 400s? OR just getting an fx5 to supplement the filters I have now. What do you think would be better? Thanks