07-16-2012, 07:33 PM
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Yeah, there are larger fish that can go in smaller tanks, and smaller fish that need larger tanks. It really depends on the type of fish and how it swims. Rainbows are very active, and benefit from having room to maneuver. IMO, a tank is too small if such a fish cannot swim at full speed. I started them in a 20 high and moved them to a 29 and then the 45, before settling in the 90. In the 45, they just darted back and forth in the tank.
At the end of the day, we are the ones that have to look at our own tanks, and we each have to decide how much room our fish need to swim. I recognize that I feel that some fish need more space than most others suggest. But after moving the dwarf neons to a 4 foot tank, I couldn't imagine putting them back in a shorter tank.