I have five with one breeding pair. Pretty solid fish, very personable. They do get 8in in aquaria but I believe the females won't get much more than 6in to be honest. They are a good cichlid community fish as they really don't instigate anything. But, I have seen them fight when pushed too far. As far as your midas, no. Oh, they are very quirky. I've seen mine swim in a circle and then upside down just for fun. If you get them just don't freak out if they do something you might feel is "stupid."