First of all, sorry about your health condition. Hope your tests give you some good news.
As to your question, my girls love the reef tanks and know the names of most of my fish and corals. I have been training Felicia (and to a lesser extent Isabella) on how I do water changes, clean the glass, etc. I'm hoping that over time, they will remain interested in this addiction and be able to take over. Felicia is the more responsible older daughter so this will probably fall on her if anybody.
The other option is to do what we see on those "Island Life" and "House Hunters International" shows on tv and end up retiring to a tropical beach side paradise where we can snorkel or swim in the coral reefs and forget about keeping a tank at home
Anthony