The thing you need to know about RC is that there is a large population of trolls living there. The internet makes it less important to filter what they are thinking before it leaves their brain so you get a lot of d**khead replies from people. Some people there confuse post-count with knowledge and influence. People are generally more reasonable and rational in their replies here and I think there is just as much knowledge and wisdom to be found here.
Liveaquaria recommends a minimum of 180 gallons . Going to a 220 would give the fish an extra 40g of water to swim in, which works out to a whopping 2cuf extra to swim in. For a fish that would swim miles a day in the wild I'm sure it wouldn't benefit greatly from that little extra space.