RadaR
The things we do for our fish..
I think the Keyholes would be OK with the Discus, possibly with the Rams but Rams are slightly aggressive whereas Keyholes are peaceful.
jeez, calm down all! The tank is being set up from scratch; hoppybun didn't start the thread saying "can I keep livebearer fry and a crab, and..." in her post, or even say that that's what she wanted to add to the tank.
I already said in my original post that I keep rams and cards with my discus, so like you Spooky, my advice was based on my own experience; and also from reasearch. I suggested risk-free tankmates which I've never seen any reports of causing problems in the discus tank. I don't see how that's particularly offensive.
I agree that a lot of the advice in discus books does suggest they are excessively hard to keep, and that this just isn't true. However, on discus-only sites and forums, you do see pictures of clearly stunted discus (rugby-ball shaped, over large eyes) which invariably arise from people bending rules e.g. re: water changes, temperature levels, or whatever, so I don't think it's fair to suggest that they are incredibly straightforward to keep.
Or what about Apistogramma agassizii?
I think the Keyholes would be OK with the Discus, possibly with the Rams but Rams are slightly aggressive whereas Keyholes are peaceful.