I have owned about ten leopards over the years with great success. They have always been easy to relocate to other tanks when I have been ready for more/others. I have never had an issue with males fighting, but that is just me. They probably won't survive a freshwater dip, copper or hypo... so know your risks of adding them straight to the display. Some of their low survival rates IMO are from moderate hypo wholesaler/store tanks (1.018 or so) and/or copper. I used to get mine direct from a hawaiian importer using full strength water, so the potters always came in awesome... and he would only ship us the other types when they came from a good collector that kept them at reef salinity and in holding tanks with substrate. If you see one in a tank with a bare bottom, or less than 1.025, or so, salinity, then I would run... these, IMO, are the ones that you take home living and they dive into the sand to finish dying.
You probably should have enough pods in your tank to feed it for at least a month. It will out compete just about any pod eating goby/blenny/fish, so I might suggest that you avoid these fish if you have a scooter, mandarin or the like that needs the pods.
Genicanthus Angels, X Triggers and Leopard Wrasses are my favorite fish, but please know your risks...