I am very sorry to hear about your loss. If you expand in the hobby, I will send you some cool fry, no charge. Fish can be a productive distribution from reality. To answer your question, I don't have the exact answer for exact species and food but I do know my fish have never eaten anything that kills them (referring to human food). I always figured if they eat it, it must be safe. Don't go crazy jump street...take your time. Small piece today then few days later 2 small pieces and so on. Unrelated I had a huge jaguar and was feeding tank above him. I dropped the plastic lid of food container in his tank. It had to be as big around as half dollar and half inch tall with threads. He inhaled it faster than I could grab it. I knew for sure he was dead. Next day alive, 2 days alive 3 days.....fish are funny. I had the biggest (and beautiful) african trout (champsichromis) no exaggeration he was 15"+. A breeding machine. The fry would come out of the females outh day one the size of my dovii fry after 2 months. We're talking a cash cow. I put in a group of 2" clown loaches. My wife said don't, they'll get eaten. I said don't worry they're too fast and if not they can use their horn bone (research it) to defend themselves. I got hit by a big clown loach once and it felt like a 2 week bee sting. Had to have some type of poison or bacteria or hit a nerve. I don't know, but bact to the trout. He chased and chased and I watched wondering if the loaches would get ich from stress and then the trout caught one. Within a couple seconds he spit it out and for 2 days opened and closed his mouth like a snake after a big meal. 2 or 3 days later he was floating. I think the clown loach horn poked a hole thru trout's mouth and got to the brain. Anyway not sure about apples but don't feed loaches, lol.
