You're the only one with the same story like that. Got 50x 2-3 inches midas cichlids as feeders. They didn't bother the smallest one that hid itself behind the overflow of the filter. I later took it out and separated it to let it grow. It grew to 8" and I moved it back to the main tank to live as I wanted to keep it. 3 weeks later during lights off they death rolled it. The next morning I only found the remaining chewed up head.