Zfishies;5117311; said:^i know that am going to go by trial and error. if any agression starts ill remove them. hopefully after introducing them so many times they might breed.
You clearly don't understand how snapper aggression (or really aggression in any turtle species) works. Often by the time it takes place, it's already too late. They don't paw at each other or give angry looks. You're essentially playing with fire.
Many breeders keep males and females of even docile species apart from each other, as aggression can be severe. They'll usually put the together for a couple days, monitor the mating process closely, and separate them after the deed is done a few times. Remember, this is the practice for many of the more docile turtles.
Now consider the amount of time it would take for your turtles to mate (an event that, as far as history is concerned, has never happened) and the sheer odds of them doing so even were they together 100% of the time. Now consider that you may not be able to keep them together 24/7, or even half that time, or even a fraction of that time. The chance of it happening drops exponentially.
Also, you'd have to have a mighty big enclosure to safely monitor two adult snappers of either species. And in a pond, you simply can't safely monitor the process. So you're just gonna throw them in, and hope for mating (severely unlikely) and no fatalities (substantially more likely). It just seems like a pipe dream.
Josh H