Propagation tests trials and experiments.

[Discus]

How many replicates will you be doing for each treatment? And what species are you trying it with?

You can also try vented vs non-vented containers, or perhaps different potential vents.

If you haven't seen it, the OSP's media book (Orchid Seed Germination Media) is pretty epic.

There was one recipe in there that seemed pretty easy to make with common "household" ingredients - if you want it, let me know.

You can also try things like with/without potato cubes etc. etc. etc. There are hundreds of variations you could do...

You can also mess about with temperatures and lighting periods.

If you want to be able to make any actual conclusions though, experimental design is quite important.