It looks like you had a detritus fallout event (not a real term) when you last turned on your filter after a water change. It's better to turn off and on your filter with the mechanical filter removed before your water change. This flushes the detritus out of your filter. Then you can clean it out of your tank as you do your water change. This happens to me more often than I care to admit. I do a thorough maintenance trimming the plants, attending to the algae, vacuuming the substrate, ect., ect. Then I ruin it by turning on the filter after the water change only to have a massive filter detritus fallout event.
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