Mark,
After finding out Red Candy Apple is/are hybrid, who knows if the F2 seeds would even grow much less produce.
The one I replaced them with this year is Red Burgundy (An OP) It is a short day onion. This is one of many links
http://www.mypatriotsupply.com/Red_B...d_burgundy.htm
$1.79 for 100 seeds is cheap. I would go with that instead of trying an F2 from seed.