That’s a great combo you’ve chosen. I’ve heard some people report their discus eating smaller baby cardinals, but when I see them in a tank with discus, it’s really gorgeous. The Cory Dora’s are great clean up crews, but are so cute in a group the way they swim together. Each one adds an interesting and fun element to the tank. I have Cories, cardinals, and 1 super red bristlenose pleco (that I got from Adam)in my planted angel tank and love them. Hopefully Adam will see this post. There may be a territorial problem among male Bristlenose Plecos if you’re thinking of 4. He would be able to address that much better than I.
Patty