Oh my dear lord...
Go to the fish store. Buy some food that says 'for tropical fish' on it. Put some in the tank every day.
You can buy two or three different kinds and feed a different one every day if you like.
Yes, you can feed them wingless fruit files, yes, you can feed them cooked peas.
Don't give them anything that's poisonous.
Feeding tropical fish is EASY, we don't need dozens of threads about it, please.