Found an awesome deal on a brand new 220 gal tank (w/stand and lighting) and corner overflows. However, this would be my first time with anything close to that big. I've never needed anything but a simple filter for a little guy tank. I've been reading through all the information on here (which is excellent btw) plus all over the net and i've come to the conclusion that i'm gonna need a sump with the overflows... am i right? or don't i have a clue? and if i am right do these types of tanks come with pre-drilled holes? i'm sure its silly but I'm feeling slightly lost.