Many threads say these fish eat anything, but mine spit out / don't go for cubed apple and zuchinni. They attack the floating omega one cichlid pellets i have been feeding them. How unhealthy are cichlid pellets for them? The pellets seem to keep my tank pretty clean of waste since they float and dont break down and fowl the water. How long would i need to fast them to get them to eat apples? Zuchinni?