Pam...Sorry to hear about your seed loss. Bummer!
I too use Park's sponges. Have used them for the past 3 years. I love the concept. I grow my seeds under the dome that Park's Seeds sells, and have had great success with this concept. I have a 48 cell dome, and place it in a south window. I also use hydrogen peroxide in the well of the dome mixed with water. I only use a tablespoon of the peroxide. Once the seed has germinated, I will leave it in the sponge under the dome until the seedling is about 5" tall before I transplant it to a plastic pot which I have many of. I then very carefully peel away the sponge to expose the roots and sdlg, and transfer the seedling into a potting soil mixture.
As for those pesky gnats, I have to deal with them every year. They are a nuisance. I might try the sticky tape. But so far, the gnats have never destroyed any sdlgs. They are just irritating flying bugs that manage to always find my coffee cup in the morning during the Winter.
Because I only have space for 100 sdlgs on my property, the price of the sponge method works well for me. I also have to take into consideration the extreme cold Winters we have here in VT, and the amount of sunlight. The dome controls the temperature inside, and when placed under lights or in a southern window works well for me.
http://parkseed.com/bio-dome-s...