Having bred several thousand discus over the years I think I'm competant enough with the species. I've seen Jo's fish and know the current size. She won't be buying additional fully grown 8" adults so adding another four will be ideal until they pair off. Which if kept properly they certainly will do.
Personally I like to see them in planted tanks. But there are many who keep them in bare aquaria. Intersstingly enough all the truly experienced big boys in the discus world would think nothing of having more than 6 fish in such a tank. Have a look at the works of Degen and Watley for more info etc.
I disagree with them being happiest when kept alone to. They are often more active and happy when housed with a shoal of suitable dither fish. As are many quieter cichlids.
Anyway, as I said, when they pair off, they'll need to be managed. Moved into a seperate breeding tank if she wants to raise the young etc. So you were half righ on the "do more research" front I suppose. Knowing the existing size and the aquarists fish and future plans beforehand before passing comment helps.
Sorry for derailing the thread Jo.
Merry xmas everyone.
