02-15-2013, 11:21 AM
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I run two heaters in anything over 55 gallons (sometimes in smaller tanks, too). With large/long tanks the benefit of having two heaters is that you don't have all the warmth centralized at one end/place in the tank with the rest of the water being cooler. The overal benefit of two heaters is that if one fails (which we all know they can/do) you have a backup that will keep you from having a total temperature crash until you get the replacement.