I use rock wool cubes to germinate mine. Ive done it two different ways. One way is in a small plastic greenhouse looking thing I got from Amazon for $30.00 that sits on a heating pad. The other way, and it worked just as good, was to put the seed in rock wool then go ahead and put it in the bubble bucket. I turned the lights on like normal to keep my cab warm but put coffee cups over the net pots that had a seed in it. I started them off in the Four Banger Bucket I got from HTG supply. I put water in the bucket just like normal and ran the air pumps as normal. Everyday I'd look under the coffee cups. Once the seeds popped and the seedling was visible I removed the cups. After they were in those small net pots for a few days I transplanted them each into their own bucket with a 6 inch net pot and hydroton. I actually think my root mass has gotten larger faster than I can remember in the past. I will probably do it this way from here on out.