I was told this and put 2 rainbows and 2 roses together. They touched, laughed, played (sarcasm for it was all fine until...) and then one day the roses looked awful. They went to hell fast and had to move them to another tank. They were fine after that. I was told nems have chemical warfare during certain seasons (like march/april) I have no way of explaining why only the roses looked like crap. GL I wouldn't do it.