I have a 9" red bellied pacu in a 55g tank now, I know I'll need to upgrade in the near future. But right now all it really eats is algae disks that i drop in. It used to eat some zucchini and pond pellets, but now it doesn't eat those anymore. The tank has been fully cycled for a while, and I make sure nitrates are less then 15ppm. The filter is a penguin bio wheel 350, and that keeps the water pretty clean. The temp is at 78 F and ph around 7. I've tried to put a piece of the algae disk in a piece of zucchini, but it just rips the zucchini apart until it gets to the algae disk. I was wondering how I can try to get it to eat a wider variety of foods.