I'm so going to get yelled at (again) for this, but I've had three males together for about six months now. I had two unfortunate accidents with two of the three tanks, and had an extra 40 gallon sitting around, so they're all in there until I can get some nice new cages or a rack. They all eat fine, never had one miss a meal, and have tons of places to hide, and none of them exhibit stress. However, the oldest one is just about a year, so they're not too concerned with breeding yet, so maybe that helps? So, it can be done, and it can be done well, but you do have to be a careful.