I readily germinate U.uliginosa, bifida, caerula, limosa, minutissima, nivea and recently got chrysantha going from seed (previously it just sprang up in my bog garden).
Soil: 50/50 peat/sand or 2:1 sand/peat
10cm tall pot.
initially flooding (1cm over surface, so the soil in a 10cm pot should be 8cm max), do this for 1 week.
then drop the water to 2-3cm below the surface of the soil until they germinate.
Aim for temps of 28-32C days and nights of 25-30.
Humidity is best above 70%, bright light (full sun through 50% shade cloth for 3-5hours in the morning is best) or 2-3hours morning sun.
For me they vary in germination depending on age, e.g. I have had bifida seed that hit the pot from the pod germinate in less than a week, but I had to wait 3months before the Chrysantha and minutissima germinated from fresh seed.
The oldest uliginosa seed I have tried was just over 8months old and it germinated fine, I would imagine their seed is long lived as in the wild some seed can be dormant for over 6months, then burst into growth.
Once they are better established I throw in a few NKP pellets (in a 5cm diameter pot, 3-4 pellets), this has a dramatic effect on the growth rate.
I also place a 1-2cm layer of rehydrated spag to lessen soil loss from the bottom of the pot, otherwise you can use a cup or small bowl.
Bifida and uliginosa also work well in a pure rehydrated spag slurry in a glass bowl or a Macdonald's large iced coffee cup (very well), same basic method as above but less fertiliser or they can yellow.
Hope this helps, and good luck