picky eaters

Question
I have a 30 gallon tank with 6 Jack Dempseys' all between half an inch to a inch
long with one Texas cichlid that is 1 inch. and in my 55 gallon tank i have 2
yellow labs (yellow princes)(and a bunch of other cichlids but their not a
problem) and it seems like no matter what i attempt to feed them they won't eat
it, with exception for Black worms and i now know that yellow labs aren't
supposed to eat black worms and I heard its not good to feed Dempseys black
worms all the time (I've only feed them these worms once).

So Far i have attempted small cichlid pellets, freeze Dried Krill, Nutrafin Max
(sinking pellets mainly used for bottom feeders and invertebrates), Color
enhancing Cichlid pellets, Omega One first flake (a flake food that is suppose
to address this problem in all freshwater fish), guppies, rosey reds, and frozen
baby shrimp. Do you have any ideas what i can feed these stubborn fish  

Answer
rell,
first thing is to get em hungry...cut back on the foods that you are feeding, do a partial water change and raise the temp 3-5 degrees.
then feed a quality high protien food..you can use shrimp, worms, thin cut beef strips from the heart.
Or you can use any of the prepared foods available as well.
Those steps should kick them into high gear at grocery time.
If you have further questions, just ask