i am stuck with a decision...i have been planning on getting the 150g, but i would like a wider tank...the 150g is 72x18x29....the 180g is72x24x24...i like that the 150g is tall.there is more view from the front, and you don't have to bend over to see it well...150g-$580...180g-$750.....is the extra width worth it????