04-18-2013, 11:53 PM
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True, the horizontal space is so important, for MOST fish, I think. And yes, its hard to heat and filter a 1 gallon (I've tried with treating a sick fish and it was a failure, as the filter and heater were both way too big, even the smallest they make). Its also harder to keep the water parameters in a good range, and if you have an ammonia spike, it escalates so much faster than a larger tank. Besides, I feel so sorry for any fish in a tank that small! Nowhere to swim and exercise!