I have an assorted cichlid (mostly mbuna) tank. About 3 days ago both of my demasoni just stopped eating. This morning my juvy cobue also did not eat. I have checked my H20 3 days in a row and found nothing out of the ordinary except my nitrates which were at 20 today. I did a H20 change and in the process found a dead fish that looked like it had been dead for about a day or so. None of them are exhibiting any outward signs of trauma or illness. I have found it weird that the demasoni's stomachs are not sunken in, but they are not bloated looking either. Any ideas? Any help would be greatly appreciated.