Just wanted to add to this from my experience of living in South Africa and documenting Pixies in the wild for the last 4 years. I am not an expert in the field and I have never tried to breed them. But a 6-12 month hibernation is way too long. I have found Pixies active from mid September (early spring) all the way until March/April (Autumn). There are different variables that can come into play, but the main variable is the rainfall. If we have early summer showers in September this is enough for them to emerge from hibernation, although the heavy rains will only start October - but once again it is a variable because we may only have showers Jan/Feb which is almost the end of the Summer season. Our winter temps are also unpredictable, but our winter day time highs usually sit inbetween 13-19 degrees Celsius and night temps drop to 0-6 degrees.
You would need a lot more males to females, more like a ratio of 2 females to 5+ males, for maximum competition. Usually what happens is we have a day of heavy, heavy rains (50mm in 24 hours) that is when all the frogs start looking for water pans. An open veld (grassland) will fill with water that is usually only fill for a few months, because these are water pans its deep in the middle and shallower on the edges. These will fill with many males that will fight for the females to breed with, which there will be a lot less of. I have been trying to find this happening now for many years with no luck, but I think I found a reliable water pan this year. Apparently the breeding will take place in the day time, but we only hear the calling from 8-10pm at nights, and usually we hear 3-5 different males calling in one particular area. In a larger water pan I could identify 20 different males, the sound was earth shattering and chaotic. A little piece of useless information, but because water pans are so temporary in Africa the frogs have developed different calling times and at different intervals. So this gives each species a chance to breed, this also varies through out the year, like the toads will be very early on, then the Pixies and other species follow them - like a pecking order almost.
I honestly think it is not that difficult to breed the Pixies compared to other species, the problem is that it will take a lot of space and a lot of trial and error. I have a running post here which will help in many ways:
http://www.frogforum.net/fieldwork/2...e-release.html