Feeders can get quite spendy. If they are eating frzn blood worms keep at it. Mix in some frozen brine shrimp as well as some frozen beef heart. You can also crush up some pellets and add them to the thawed out frozens mix. Try and feed the small guys as much as possible. Atleast 2-3x a day.
As stated, quality feeders arent a bad choice. But when that is the main diet of small cichla for some time it may be hard to get them off the feeders an onto some other type of food.
You said you had 2 die...was this from lack of food? What is you water temp at and how often do you do water changes?