The infertile eggs go white and also pick up more meth blue if you are using it. The fish clean the eggs and fry and look like they are eating them (and often do ). If you are serious aboutbreeding them you should remove them, then they can't get eaten. Also make sure you have a market and plenty of grow out tanks as they are very productive once they decide to stop eating eggs. The biggest spawning I had was one of the first and was 1226 raised and sold. They can lay every 10 to 14 days for 18 months.