Hi,
As a grandmother of 12, I also suggest watching the little person very closely. Once the tikes figure out stuff can go into the tank, it won't be just food they toss, but anything else they can find.
I speak from experience... toys, their hotdogs, the baby powder, you name it. Your tank is not safe. So don't let junior in that room alone ever again.
I have a two year old that terrorized me and my tank. He is four now, I love him to death, but I still don't trust him near my fish tank.