My vote after hating internal overflows for years: coast to coast on the end against the wall. Internal overflows are the devil. They mess up flow patterns, create dead spots, are ugly as sin, make aquascaping harder, and make your tank look smaller.
Also, go with the biggest tank you can afford to maintain. If you get a 5 footer, you'll probably wish you got a 6 footer after a year.
I'm also partial to wide tanks. 30 inches gives you a lot more floor space to play with
|