yea, i have been experimenting recently with adding more males to the mix. with species such as phantasticus which arent known for aggression, i've seen some increased aggression as multiple males are kept together, but really nothing serious. i just recently got a new male corkbark in hopes that his presence will kick my LTC (1 year) male into breeding. however, the new guy is still in isolation till i see him fatten up, hydrate, and get rid of those darn mites. but i have definitely seen a lot more activity out of my satanics ever since i started keeping more than one male per group of females. one male of mine that i've had for a year now spent forever with no interaction with the females, then once around all the other males he mated, along with each of the other guys. my male henkeli is doing his thing without the presence of another male, so ill keep him at that. im still debating whether or not to get another male mossy to spice up that mix, even though i said i've finally finished off my collection...but as eve said im never done. so if you decide to put another male in, be sure to keep a real close eye on them. if you notice any weird sounds, i would recommend keeping an even closer eye on them, perhaps separate them. maybe having 2 pairs split apart, but with glass tanks side-by-side would give the males enough to communicate and prove themselves to the females and one another. be sure not to just put one male in for every female, or else you're really gonna ask for trouble. i would keep it at 2 males at the most for medium/larger species, unless you happen to have a ginormous enclosure, in that case you could possibly experiment some more but ALWAYS KEEP A GOOD EYE ON THEM and have something ready in case you must separate them. sometimes it just takes a little patience as well.