I would definitely keep Melafix and Pimafix on hand (and do) but I also have an extensive pharmacy of things like the Fungus Clear Tank Buddies, Triple Sulfa, E.M. Tablets, Epsom Salts, Clout, Furan-2, StressCoat, and of course my freezer always has a bag of frozen peas. There are a lot of other things I have but do not use anymore due to being disillusioned by them so I will not mention them.
Rose
p.s. I am not recommending you go out and buy all of those things, just listing the things I use and keep on hand, but you have an entirely different fish set-up and would have to decide how extensive you want their pharmacy to be.