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What is the school of thought on filtration for a 20 gallon divided tank .. there are 4 sections. Should each have its own filter?
If there are holes in the divider you could probably get away with one filter but you’ll need to have air stones to increase movement between sections
I use an undergravel in my divided tanks.
I have sponger filters in each of my sides so they agitate the water, but I bet you could get away with less filters and just put air stones.
4 sections, 4 XY-2830 sponge filters.
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