I have a male BN and an albino female, she is yellow with red eyes. This is her second time laying eggs, the first time I wasn't aware she laid eggs. This time I was more focused on changes that were going on in the tank. I moved dad and eggs to a separate tank. The eggs have hatched and a few have gotten out. How old are they when they start getting color? All I can see is the yoke sack and transparent tails wiggling.