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I believe those are the filters that contain carbon- is that correct? If so, you'll have to replace them eventually as they're really difficult to clean and it's not ideal to keep the same carbon in the tank forever.
Therefore, you can replace those filters with the same ones, scrap them altogether, make your own filters from mesh/felt, or use carbon in a media bag or reactor- all of those last options will save you money compared with buying the filters from coralife, which I believe are around $4 per filter.
In terms of the bacteria on the filter, while there is some, assuming you have enough live rock in your tank during your cycle, you're fine to remove!
22 lbsHow much live rock do you have in the tank? Assuming you have more than a few pounds, it shouldn't make that much of a difference.
thank youSo I'll give two answers on the frequency
If you decide to run carbon in this tank, most people replace it every 2-4 weeks.
If you decide to run mechanical filtration such as a piece of felt (as in the one you currently have) or filter floss or even a filter sock, the ideal time to change them is every couple of days. This is if you are looking to remove large organics from the water column before they can break down to reduce your phosphate/nitrate levels. If you are looking just to "polish" your water, which is to say remove all the floating crud you can see with your naked eye, then you can go longer. After about 5-7 days, the filters will actually retain organic matter that rots (as it can't be removed via water changes), so your nutrients can actually go up compared with running no filter (the so called "nitrate trap"). You may or may not still get some filtering, assuming any pores are not clogged saturated at this point.
Just remember, the changes you'll get from running them too little or too long aren't really that important in the grand shceme of things- it's not to say it doesn't matter, but your water change frequency on a tank this size will have much more of an impact compared to how often you change this filter