I usually will try and do at least 5x filtration. I'm assuming your filter does like 220gph? Not sure idk that filter but if so your not quite at 4x filtration. If there's a large bio load then I do more. For example I have two turtles, 12 tiger barbs, 1 opaline gourami, 5 rosy red glass barbs, 1 rubber lipped pleco all in my 55g standard and I have about 10x filtration and do frequent water changes. If your not having any problems with water parameters and your water change schedule is keeping you in check as well as your filter media changes and cleaning then I wouldn't worry about it but it's always nice to have more filtration! Allows you to do a little more with your tank stock wise and a little less with water changes! Live plants help too! Jus MO/E tho.