Hello, my name is Shaun and I have a 2+ yr old yellow tang in a tank that is 3 ft long. I have the right to remain silent, etc. My Legal representation can be reached at 508-273-2134.
The tang is the fattest fish in my tank. Second most healthy fish I have is a 3+ yr old Mandarin who East the same food.
I also have a 6 ft long tank... My 3ft long tank is 18 cubic ft while the 6 ft long is 6 cubic ft. If I apply the rule of large tanks, while it is longer, the 6 ft is dwarfed.
Its all relative. The rules often made on the internet are typically grounded in truth, but subject to interpretation. Some fish require more room, and it is common for and pet hobby to want to "do more with less" but I have seen plenty of unhappy fish in a 300g tank so the rules are not always hard and fast. Tang Police mean well, there will always be an angry mob with torches and pitch forks, but what each person does with the information when you separate the mob's emotion is up to you.