Depends. Are you going to attempt to cycle the kritter keeper? If so then yes, the filter will help by upping the surface area inhabitable by bacteria. A zoomed 501 or Tom Rapids mini canister would be a better choice for that, will add much more room for error.
If you're doing a bare bottom QT tank, then you just need a source of circulation, whether it be a small powerhead or airstone. Water changes will need to be done every few days to keep ammonia from rising above 0.25ppm. I use a small Red Sea nano HOB with carbon or full water changes in that instance to remove meds. Sometimes I use a small submersible UVS for circulation if I'm QTing new livestock.
The main problem with Kritter Keepers under 5gl, and any container that size, is that there really isn't enough surface area for bacteria to keep up with the nitrogen produced form even one betta, let alone multiple fish. It can take one fish anywhere from 2 to 5 days to produce a toxic level of ammonia in a container that small. In a fully planted nano cube or similar, that is fed CO2, then plants can do most of the work there, but in a "lame fish tank", I imagine intense plant growth is not the objective. They work great for meds since many treatments will advise water changes between doses, anyway.
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