Hmm.... I'd agree - maybe the red eyes need a closer watch. I have all of the above in my big tank too (2 bleeding hearts, 2 lampeyes, 2 rams..) The bleeding hearts don't bother a soul except each other. Ever. I'd find it hard to believe they're nippers, but I guess strange things happen....?? Lots of hiding spots, plants, and caves might do everyone some good.