My 2 yr old SA Cichlid tank isn't looking to hot. I recntly removed two fish from the setup a Male Convict and A Male Firemouth. The current inhabitants are a Jaguar, Parrot, Anouther Firemouth and a breeding pair of jack dempseys. all in a 55 gallon with slate rock, a canister filter and a HOB filter. My problems started when I did a 15 gallon water change and removed the 2 fish and did some new aquascape. The once breeding pair of dempseys are acting very weird, the female looks all beat up and is up in the corner of the tank. The male is also beat up looking and his tail fin is all white. He is hiding under neath some rock and wont come out even when I feed. firemouth and parrot are fine hanging out on the other side of the tank. Tha jaguar i think may be the problem because he is chasing the dempseys around alot and flaring his gills at everything but he also isnt eating. i dont know what dto do please please help me.