Funny how that food makes them act. Hikari Massivore Pellets must have crack rock in it. My fish act the same way. Turn their nose up at other foods. That is some really amazing growth! That almost twice as fast as anything I've ever seen or heard of regarding Hoplias species. You have any photos of the fish as it grew? I'd love to see them. My Aimara Wolffish is growing at about 1" +/- per month so far. I'd really like to know what you're doing differently, if anything, to get that kind of growth from your Wolffish. Thanks