Since your fish are pseudotropheus i wouldnt' suggest feeding black worms, blood worms, beef heart or any other high protein high fat animal bassed foods. Fry can take higher protein and fat levels but i wouldnt' be feeding them those foods, they arne't really the best for africans.
I feed my fry(newly spit fry) frozen BBS and cyclops. Then i move them up to NLS spectrum pellets. I foudn that the NLS pellets made them grow the fastest. I used to feed them flakes, frozen Brine shrimp and any other food i had around but the NLS makes them grow the fastest. I also feed my juvies small quantities a couple time a day.
Doing 10-20% water changes daily or every 2 days is the most important part. The water changes will help them grow quickly.
