My experience with them; My male isn't aggressive with my other geos, mine has no "hump" due to no female in the tank, mine keeps to himself and is quite peaceful overall. I also have sand instead of gravel so that he and my other geos can sift it. I heard of lowering the temp for 4 months or something, to replicate their natural environment, but you'd have to do more research on that, I keep my temp at 78-80 and he is ok with it. I also have a UV in my tank because I've read they are prone to Hole in the head (HITH) as are most South Americans and Centrals.