for my HOB on my 90, I did not get a wheel style filter, I am not a fan as they get clogged, and that wheel thing just limits what I can put in it to improve the HOB usefulness. I spruced up a boring whisper filter HOB. I have two rated for 60 gallons each, for my 90. I kept the black sponge thing (mechanical filtration) in the compartments but tossed away the white carbon filled pad. those things seemed to cost a fortune and get used up in two days, only to get clogged with algae inside of four days.
I replaced those white things with two media bags, one of each side of the filter (the 60 gallon HOB has two chambers). I put one media bag with carbon pellets and the other with phosguard. So, with the two filters, I have two bags of carbon and 2 of phosguard. my tank water seems to be pretty clear and my parameters are spot on
-Doc