Rummynose are probably the best schoolers and they can tolerate the high temp of discus…..but I still love cardinals and green neons….Denison barbs are great but they are fast and aggressive feeders and they get bigger….not tolerant of high temp
I have had kept Denison barbs with great success even with discus at higher temperatures. Though I didn’t keep with discus for years as i had to rehome them because, like you said they are aggressive feeders
