| did you acclimate them to your tank proporly? whats your ph kh and gh?
chiclids like really hard water and the ph to be in the 8-9 region.
also people dont usually recommend feeding feeders to your fish. they lack certain nutrients and probably specific amino acids (dont quote me on that) that are essential to fishes growth, they are also known to be more commonly diseased because they arent cared for as much.
how big is your tank? standard tall or long? what kind of cichlids are they? do they have any physical changes, bumps redness or anything? how do you know their dying, what type of behavior are they showing?
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55 Gallon Tank:
4X yellow lab
Breeding pair of Red Empress
Female OB peacock
S. Fryeri
Syno. Catfish
Blue Batia
Generic Pleco
One Tinfoil Barb (i couldnt get the thing out with a net or anything else, so i guess its there to stay...) | 
