No corys for me then. I've seen so many people keeping them with other cichlids, angelfish, denison barbs, even snakeheads, but I never planned on doing that anyway. I just got caught up in all the recommendations, but if the temperatures are off, I'll pass.
My tank will be on sand substrate, so easy siphoning is a big plus. Now, about those numbers... I was thinking 8 discus, around 9-11cm each. And for the cardinals, as many as possible would be great. What's everyone's take on this?