[jk]

I've had success germinating Nep seeds on (1) long fibered sphagnum moss; (2) a mix of 50% peat moss and 50% perlite; and (3) coco peat, all unsterilized. Nep seeds need light to germinate, so I simply scatter the seeds on the medium and press them down a bit so they make good contact with the medium. I put them outdoors in bright light, uncovered, and they are sprayed with water three times a day by an automatic watering system. The plants are transplanted to individual pots when they are 2 cm. in diameter, keeping as much of the original medium around the roots as possible. If too crowded, however, I transplant them when they are as small as 1 cm. in diameter, although the mortality rate is higher. At this stage (or even before), the plants can be fertilized. However, fertilizer tends to grow a slimy substance that appears to be algae on long fibered sphagnum moss. There are probably better ways to do it, but this method works well enough for me.