So was just on my aquaponics forum. Guy telling a newbie that it is perfectly safe to keep fancy goldfish with tilapia, that the worst that will happen is fin shredding. Of course this is the same guy who argued with me that he really didn't need that much room to house and breed 50 pacu or if you maintqain your tanks properly a 20 inch oscar was not only possible but normal. Funny how he didn't have pictures either.