I think leaving them alone may be your best bet. Just stick two together and forget about it for a while. Mine took about 3 or so months to start and I think it was because I was impatient and constantly screwing around with different crap thinking something was wrong and trying to speed it up. It took me giving up bothering with it for about a month and a half for them to really start knockin boots. Im a blocker I guess, killing the mood with all the hands in the tank, the anxiety and whatnot. I think I expected them to have babies in the bag on the way home after I heard everyone say how easy and fast it was. Id say don't let embellishment get you all antsy, nature takes its course over time. Also, mine bite at each other and get all rammy before they start going to town. Convicts like it rough. Woof Woof.