As long as its digestable & closely resembles the mouth part size on full inflate, then your laughing. Most will take it, & will reject anything that doesn't sit well with them. the strike rates pretty high in you favour in this regard, regardless of species.
If you have the fish/amen combo, then 2 things result. 1st the fish indirrectly feeds small pieces &/or juice in its own greedy feeding practices, or 2, by dirrect gross feeding near the mouth part with my fav(training chopsticks) & it is rejected, the fish or surrounding animals are more than likely to mop it up anyways.
worst case, chopstick it out of there to your pirhana tank.
