my sisters new tank

hi mi name is Rennen as you can see in my title and you can see all about mi title in Rennens fish blog or blog tow. anyways mi sister got new fish tank she has the gravel water and inserts in but she doesn't have filtration in it yet or fish the reason she has no filtration is were trying to figure out what type of filter it is were pretty sure its a hang out side filter but were not sure because it has a tube and mine doesn't. well that's all for now so bye.