Hello all, I am looking to purchase a saltwater aquarium I was looking at a couple different ones. I have decided on a 180 gallon. I found one built by custom aquariums it is the right size. It has the over flows at the top back of the tank that go into pipes down the back. not the typical drilled in the bottom type. my question was, is there any performance difference? I don't normally see this type so I wasn't sure if it was okay? any thoughts are greatly appreciated !