No other filtration at all and just a 10% weekly water change....but as you can see what works well for one doesnt always work for others, been running my current nano above for several years now with just this filter and media
Personally would never run a canister again after running the seachem tidal 35 the Seachem's are just so much easier to use and provide excellent aireation of the water
Like sumps some people love them myself i prefer to run without one even when running a larger tank unless it is an all in one and built into the back section of the tank,won't run a skimmer either i let the Polyfilter deal with it so running sumpless is not a problem for me
I like to give my fish plenty of personal space though, really can't abide a heavily fish stocked aquarium myself...in my last 40 gallon with a filtration section in the back i kept 2 clowns a bangaii cardinal and a yellow watchman goby and considered that fully stocked, i ran that one for a decade with just Carbon, Polyfilter and 10% weekly's, my filtration choices work well for me but if you like a heavier stocked aquaria then beefier filtration options would offer you a smoother ride without your tank ending up looking like Frankenstein's Monster of HOB equipment and leaves your future options wider
My advice to you If you plan to add plenty of fish....go sump or rear filtration section
If you plan to stock sparingly...a single hob filter can work well
The one thing i found that works best for me after 20 years of reefing is.... Keep It Simple