04-19-2012, 10:57 PM
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I always go long over tall (I don't keep saltwater, but Taz's point sounds valid for it).
Fish prefer swimming side to side, not up and down, and a longer tank will provide them more room to zoom back and forth.. Some fish like freshwater angels, they can grow very tall, over 10" tall.. so my 12.5" high tank would be horrible for them. In this case height is also very necessary. Even so, you'd want a pretty long tank too for them. Fish like bottom dwellers need a large lengthxwidth, height doesn't affect them as much.
Long tanks also have a larger surface area, providing more area for oxygen and CO2 gas to travel between the air and water.
Last edited by Olympia; 04-19-2012 at 10:59 PM..