By this im saying, when people can no longer keep thier fish or put them up for sale do sizes matter? I've noticed that many sites feature price by size...bigger the fish...more money.
Im curious because thats how I know in the future.....such as my cousin has a sail fin tang in a 70 gallon.....He likes the way it looks, but is going to sell him when he's to big. He's pretty big the tank nearly six inches length and about 5 inches high. Does this mean that it worth more as a "Show Size Fish (Near max size of fish)" considered more valuable?

Im curious because thats how I know in the future.....such as my cousin has a sail fin tang in a 70 gallon.....He likes the way it looks, but is going to sell him when he's to big. He's pretty big the tank nearly six inches length and about 5 inches high. Does this mean that it worth more as a "Show Size Fish (Near max size of fish)" considered more valuable?