Finally am the owner of a caribe. He is the largest in my collection at 8 inches. Rearranged the tank before i put him in (basically shook up my current crew) and then put him in. Now after a couple of hours of him being in the tank noticed that the alpha p remains the same so far with my 6 inch piraya which is like the smallest guy in the tank. He alone owns about half of the 125.