I've seen a variety of large aquariums and I was curious about the length vs number of gallons, does it matter ? There are some not so wide tanks that are still 300+ gallons and they have monster fish in them. Is it more about the gallons of water or the length that matters ? I was under the impression that you want length so the fish can have more swim area, is this not the case as long as they have over-all space to swim ? ie would a 4ft length 600 gallon tank make sense ? Is weight more of an issue with shorter lengths and higher heights vs longer lengths ?