Repeat water changes and gravel vacs will clear that up pretty quickly.
If it's inside the filter
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Repeat water changes and gravel vacs will clear that up pretty quickly.
you could vac the inside of the filter or just disconnect temporarily and rinse the inside of the filter itself in the tub or sink BUT not the inserts so you don't lose your bacteria
But see what's dirty is the part where the filter media holder sits in not the actual media holder itself.
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The second filter is helping get the particulate out of the water faster. That's a step in the right direction.
In that picture, I'd think you're facing some kind of nutrient deficiency, so not addressing that would simply bandaid the problem. However, that could also be a result of the crap in the water, and it may look different when it's clear again.