Dead Clowns

no I wasn't even home and my dad never does anything with the tank or really any of my stuff other than what I told him--( feeding and lights)-- he may have overfed but it was only with flake food for those 2 days (since I didn't want him to have to go though defrosting peices of mysis and putting it in there) so I don't think that should have killed them.
 
Is there a possibility that a chemical or something got into your tank? Could your dad have sprayed something around the tank, or did you maybe have soap or anything on your hands when you added the zoas?
 
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