I had a Nimbochromis fuscotaeniatus, and he died a few days ago because of something I haven't quite understood yet. It started about a month ago. He started smacking his mouth and yawning a whole lot. I found him upside down the other day not quite dead yet. I examined him and found that in the back of his throwt, he had coughed up his stomach or some kind of his guts. That was when the sad and helpless feeling came over me. Knowing that there was nothing I could do for him, I put him out of his misery. I had him for about a year. He was almost fully grown. He was about 8-9" at the time of his demise. Now, my large Scianochromis friery has started the same mouth smacking and I am super worried. I checked him out yesterday, and there is no sign that he is coughing up his guts, but he's still obviously trying to tell me something with all the commotion. I was told that if the food I feed them has a high fat content, then that could have something to do with it, but I'm sure it doesn't (1.86%). Any help as to what is going on in my tank would be appreciated.