Ok, so I'm assuming drilling holes in the bottom of the tank and having an internal overflow is a lot easier and possibly more quiet then having an external overflow. I'm not quite sure on all the mechanics of the sump and overflow, but I would love to learn more about each. I guess I'm questioning the set up of it all. I have a 180 gal tank and a 55 gal sump. My tank isn't drilled, but I would prefer an internal overflow. So to my knowledge, I would need to drill 2 holes, either in the center or a corner that'll have 2 pcp pipes running from the sump up into the tank and "spit" out over/right on the top of the overflow box into my tank. Is that correct so far? And this produces better filtration and water movement? How many inches should the holes be and where would I go about buying an internal overflow box?
Any advice helps! I'm a newbie Thanks for looking!