as soon as the yolk is gone and theyre eating pellets, you should be fine as long as you maintain the tank. this just ensures that they are able to taking in a food source aside from the yolk
he seems healthy he eats twice a day. kind of a picky eater, he eats freeze dried krill and live brine. he doesn't like blood worms. any other food suggestions would be appreciated.
give him time... soon he will be checking everything out... i have problems getting anything by mine to my other fish... i mainly feed him tilapia fellets... but also freezed dried krill (which you are doing), shrimp, scallops, and night crawlers...