I can actually throw a little insight into this scenario. I've kept rams with angels briefly and the angels terrorized the rams. It's only at feedings. Tank may be calm 23 hours a day but at feedings all hell would break loose.( Spawning is an entirely different scenario and I have no insight there, speculation would lead me to Michael bay movies when everything explodes all at once and an angel comes swimming from the flames, triumphant) I really don't like angels, theyre nasty little things. Now... I did throw an electric blue ram into my discus tank, he was a widower, sub male in a formerly 2 pair tank. He chills with 8 discus ranging from 2-3", alpha male will whoop the other discus during feedings. Last night the ram had every other off the food, little guy went bonkers. The discus wanted nothing to do with him. If you've watched an angel/discus eat than you'd be as shocked as i am. Rams are such dainty little eaters, I mean they eat but more of a picker than vacuum..cant make sense of it? Discus were like.. "who's this little Smurf eating all my food?!?! Hey Smurf!!! That's my food!!" Smurf is like a little line backer..
I'm not really here... fell in the tank and my phone is just that smart