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.
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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.