Drew, I can not advise on the selling off of contest fish but if you review the rules you will see once the eight contest fish are selected all other fish are suppose to be removed from their tank. Now I myself have violated that rule with the introduce on a Batch A fish used for teaching my contest fish to eat a new food. The Batch A fish served it's purpose and was removed after two days. Also note that I have excused myself from moderating the contest
From the rules, last sentence.
4. A suggestion is to start with a group of 30 dime size fry and you then document it weekly.. You may start with less than 30 fry but you decrease your odds of a good group. You can not have more than 30 in this initial group. You can tape a dime or other similar sized object to the tank. When your fry are approximately two months old you will choose the best eight fry to follow the rest of the year. At this point a quarter must be taped to the tank or a similar sized object as a reference.All others should be removed from the tank.