They are usually barely adaquate, but if you are keeping large, messy fish, then you want to at least double the "adaquate" filtration. The equipment they include with their tank kits is the cheap stuff, so it's adaquate, but not much more than that, and not what I'd call Good stuff. For just starting out, it might not be bad, but know that there's better, more efficient stuff out there. And it awful to lose your first fish to a filter breaking down or your heater going haywire and either cooking your fish or allowing them to get too cold.