Wow hold on there, to the people suggesting a 55g tank for a tiger, the width of a 55g tank is about what? 12 inches? And the length of a tiger as an adult as around 18 inches? I wouldn’t recommend anything smaller than a 75g for those guys primarily on that fact, they just have too hard of a time turning around in a narrow tank like that. 125g tank would be the optimum tank for these fish.