Yes they look fantastic together i have done it for about 4 months now the only problem u might run into is breeding and that will only be a couple of nips. Not to scare u but once or twice ppl have had there ray grab a discus and sufficate it but thats a big ray and small discus
Great combo i have some P14 with some amazing discus at my store and I love the tank, Thinking about doing it with my 600 gallon like 1000 discus and 5 rays would look crazy.
thats what i was thinking expensive meal. i know of rays that have eaten adult geophagus. i keep some flying foxes to control algae but they don't last forever.
It really depends on the type of rays. I kept discus with histrix rays for about 8 years and did not have a single incident. However, I did not date keep them with my motoros. They would not have lasted a week.