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I have an XP2 filter on my 46g. If the housing is cruddy, I clean it every 3 months or so. Oddly enough, I find common snails in it. There aren’t any snails in the tank itself, guess the large angels get them. I totally clean my HOB’s on the smaller tanks once a month.
really depends on the filter and tank. ones that i have a pre filter on i clean that often but not so much the rest of the filter. canisters depending on the tank once again i use them mostly for flow and take dirt out of the water. i clean them once the flow goes down.