Still recall that great shot of a swordtail you shared here.
Your success with the goldfish impresses upon me how adaptable they are. Originally temperate color sports of one of the Asian carp species, they were kept in large ornamental, painted bowls on floors - which had to be pretty cold in the winters - and in ponds. Yet yours have done very well in a warmer climate.
I recall you had a pretty good sized tank. I imagine that it will do for a discus. I also recall you championing a little pre-purchase research into the needs of fish and the eventual sizes and ages that fish will attain.
I'll bet you will have no trouble keeping the tank at 27.5-29 C. I don't know about the availability of discus books via your libraries. I might Google good discuss books, if you haven't already and take that list to the library. As with so many other facets of the aquarium hobby, there are probably a variety of info sources about discus on-line ranging from so-so to excellent.
I encouraged a real go-getter who became quite a discus breeder some years ago. His success owed very little to me. It was fun hanging out at his place and bouncing ideas off of other guests and I probably learned a lot more from them than they did from me.
Discus people are often as into water chemistry as aquatic gardeners and, because of the discus' need for very clean water, probably on pretty much on a par technologically with marine aquarists.
Certainly I get away with thing with the killies and livebearers (though really fancy guppies can be more demanding) which one wouldn't want to try with discus. Joe dropped by here once, to visit my low-tech fish room. LOL! He face went ashen!
That discus could run up the life expectancy of a dog. Your aquarium livestock purchases may be taken care of for a decade or so. :)
I'm glad that you got in here Charlton. It is probably obvious that the software has gotten pretty buggy. Scott L. is working on that.
You may have noticed that as the software seems to be entering double posts of your diary to the (obsolete) log queue. I think I've deleted it a couple of times today.
It is possible, with a little perseverance to sometimes do a pretty successful search of Guppylog with Google. But you've probably noticed stuff missing. Here's hoping that Scott can revise, replace or remedy what is wrong! :)
Hope that discus becomes a part of the family! They are schooling, social fish. Guess you have a role to play. ;)
All the best!