At this point, the most important factor in seed germination is proper hydration, followed by constant high heat. Maintaining proper hydration is the trickiest of the two. Water your containers thoroughly, but just as important, let them dry out thoroughly before watering again. Over-hydration can drastically reduce the germination percentage. Once seeds begin to germinate, the containers will require more frequent watering.
Some growers provide constant bottom heat by means of electric pads on their benches.
Thoroughly saturate the sphagnum moss with water and wring it until no more can be expressed. Check inside the bags periodically to ensure that the sphagnum has not dried out. When transferring germinating seeds from the relatively sanitary conditions inside the bags to pots containing ordinary medium, treat them to a precautionary fungicide drench. Germination setups can also be improvised from plastic foam boxes with tight fitting lids, such as are used to pack fish or fruit. Use a hand mister to dampen thoroughly the seeds and perlite, replace the lid and place the box in a warm location.