I have a colony of Phenochilius Mdokas. The two smallest ones dont seem to like to eat any flakes or pellets but only frozen brine shrimp! They spit the flakes out and let the other 4 fish eat them all. But the second i put frozen brine shrimp in the tank they go crazy and eat as much as possible. Is there something else I can feed these fish that is more filling? These are pretty big fish( the small ones are 4 inches) and they need alot to eat, not just little brine shrimp. Any suggestions would be awesome. Thanks!