Last time i left my fish in the care of anyone else i got a phone call half way through my holiday saying that most of my fish had died overnight (a couple of hundred quids worth died). Id left all the food in little containers in the freezer with what tank each one was for and what day to use on clearly marked. Unfortunately feeding wasnt the problem, my friend who dosent keep fish didnt notice that the powerhead that drives the main filter on the tank had stopped working and didnt realise anything was wrong with the fish until they were actualy dead (he thought they were at the surface because they were hungry but didnt feed then because id told him not to). I would only leave my fish in the care of another experienced fish keeper or pay the lfs to come round and take care of them now.