Ok so I have a 1-1.5 inch red tiger mota (parachromis motaguensis) and got him at about half an inch about 2 weeks from a fellow MFK'er. When I first got him I put him I put him in a 55 gallon with one small jack dempsey about .5 inch. Note: when I first put them in they were about the same size. Well my filter stopped working on my 55 so, I moved these two to a 10 gallon with 3 other jack dempseys one about the same size, one smaller one, and two bigger jack dempseys ( about 1.5 inches). Well it seemed like I'd find one of the jack dempseys dead at the bottom of the tank. Well when it came down to the last jack dempsey I was watching the tank and the mota was chasing him whenever he got near him. The next day that jack dempsey is dead. So now its just the mota in the 10 gallon growing out waiting to go to my 125. (Soon will have a 500 gallon can't wait). Can u believe a fish this small could be so mean hers a pic of him