Might have to pay someone to come look after them? Im looking after a guys tanks ATM. His partner feeds them every night and doses the ferts in the planted tank, And i just go over every month and water change all the tanks. One of the tanks is a 1000L with an oscar, big plecos, convicts, clown knife, and other cichlids, so its a bit of a challenge to water change, but its all good. takes me two hours a month to water change a 1000L + sump, 2 x 300L's + sump, and a 200L planted (inlcuding trim and co2 bottle change) Hes away on an army trip for 6 months....
You just need to find someone willing to do it, and who you trust with your fish.....