You can run a small skimmer, such as the Aquaticlife mini protein skimmer, inside of an Aquaclear 110 HOB filter. This leaves you a good portion of the filter (maybe 2/3) to run media bags, filter floss, whatever in, and you only have the one piece of equipment hanging on your tank. Depending on which mini skimmer you use, you may have to rig a platform or baffle to get the water level in the filter to the ideal height for the skimmer... but its not very hard. Ive been using this setup on a 20 with success for over 3 years now. Its far from perfect, but other than using a sump, I haven't come up with any better solution. If you're interested let me know and i can provide pictures of how i have mine setup.