Hey,
I managed to seed S. valerandi last year but never really had any idea on how to germinate the seeds until now. as part of another werid scheme i came up with while trying to get out of revision for exams (which im still doing).
I had previously tried growing it on my windowsill but i think its a bit too cold here in the north of england so instead i used a Fluval 4plus pump (not sure of the appropriate model for NZ? it is big enough to deal with a 4ft tank while having an inbuilt venturi). when you attach a spray bar, water shoots out of the venturi. so i attached a piece of air tubing and rigged it up to deliver water to the brace bars either side of the tank which i laid out some java moss which was clogging the intake strainer on another tank and hey presto! the beginnings of a hanging garden! at the moment there is Bacopa, Anubias, java moss of course, java fern and obviously now S. valerandi. il get some pictures up very soon to give a better idea and maybe other people could have their own little babylon!
There is a hell of alot of seedlings!