This is the one without the biowheel attachment. It is only slightly used (less than 48 hours) I do not like it because the outlet tube isn't long enough for me. I have floating plants and therefore keep the water level down from the top. This filter's outlet tube is only about 2" long. Works well, is quiet, has the option to use mechanical+biological filtration or mechanical+chemical filtration. Is a nice little filter. I wish I could use it because its footprint is much slimmer than most HOB filters and it is very powerful. Will sell for $35 shipped, will trade for live plants such as hygrophilia carymbosa, crypts, or red root floaters or pleco/cichlid stones/caves. Will consider other trades, PM me what you got.