Egg yolk does a great job in clouding up the water...imagine what that does 5 to 10 times of feeding daily. To answer your question, you can continue till they can consume crushed pellets or flakes.
I’d use frozen or freshly hatched baby brine shrimps or micro worms.
Today i will be trying crushed pelletsI like using regular cichlid pellet pulverized in an old electric coffee grinder, if you have a sponge on your intakes, they will feed off the sponge that it collects on.
I have looked everywhere for hikari first bites but did not find anyYou can also use frozen baby brine shrimp or what I like to use the most is the hikari first bites if they are still small enough.