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Size:  65.9 KBi use a canister filter for filtering my Bullys lagoon, its great i change it once, maybe twice a month. depending on his pooping in it. its a beast of a filter with 4 layers of filtering. i also use the "For turtles, an Pond" filter bags. over a month now an it still goes strong, not a problem. An bully loves his lagoon time. an the occasional fish