Gsp is marine basically. Now an F8 is fw if I remember correctly but the fresh they come from has parameters that's easiest to replicate with light brackish.
You could probably keep Schoutedeni puffers with discus. My Schoutedeni has never gone after a fish. He wont eat chopped tilapia they are one of the most other fish friendly puffers. All though it is possible to get a mean fish from time to time so like everything else you have to be careful. Puffers are kind of like pitbulls if they bite its going to be bad. Now I cant speak for all puffers but I think that analogy would fit the Schoutedeni the best of all puffers maybe along with the mbu because overall they are gentle. The down side is they are expensive, but if you look hard enough you can find deals. People are starting to breed these and selling captive bred ones much cheaper then the wild caught. Some people are selling them for the same price as wild caught too though.My lfs can get colomsesus asellus in for 5$ is that a good deal and would they get along with discus
Thats a very good point. I wasnt thinking on that at all.Personally the intricate environments that puffers require for stimulation clash with a Discus' need for clean water, lots of decor makes it more difficult to keep everything sparkly clean as discus like to have it...
Long term F8 still require that bit of salt... its not much but is enough to kill them long term if they arent kept in their very light brackish environment...
I was talking about in the wild. I read a paper talking about they're wild parameters and there was something about it that made it easiest to replicate with light brackish in captivity if I remember correctly. I can't find the source though.