You’re going to find conflicting opinions on housing rbtas together. I used to believe you couldn’t keep “wild” nems with these newer “designer” nems but have since changed my mind. I thought that after my nice, expensive sunburst was bullied into a rock and then eventually died. I now have a massive chi sunburst with infernos, a supernova and a basket of rbtas, gbtas. They do have their own space- sure they can move around but they seem settled where they are at. Can they bully each other and use chemical warfare- yes but if they aren’t next to each other it seems less likely. This is all just based on my experience. 2 things to consider- have Cipro on hand just in case you need to medicate one and run carbon so any chemicals are removed from the tank.