Hey don't feel bad my four year old did the same thing to my tank right before we moved. It was also my mistake as well I always would let him feed with me i would put some in his hand and let him drop it in. Well he thought he would help out and guess what happen! Live and learn the new tank will be set up and all food wil put in a cabinet in the kitchen where hopefully he won't get into it there. I hope everything goes well and sorry for your loss. I lost a powder Brown tang that I had for three years and two clowns along with about five hermits and 12 snails oh well it was my fault of sorts.