ok i got a 210 reef ready with return pump at 1440gph ( before headloss) anyways i was think to get another filter but does not have any more room for any big caniter filter if i go with small caniter (like XP3 or fulval 405) then i may as well go with HOB since HOB is a lil cheaper ..but never have one of those HOB so guys tell me with one is on top of the game thanks all