Hi Ted, you will not want to feed your fish while you are gone if water changes are not done. That will hurt your water quality and perhaps your fish. Instead fast your fish three days prior to leaving, this will help to empty their bodies of poop. Then do your large water change and no lights while you are gone. Be check to have your house sitter check on your fish. If one dies have the sitter remove the fish. Leaving the fish in the tank will spike the ammonia which could harm the remaining fish.
Pat