No doubt you received some (40+?) D. scorpiodes gemmae from BCK. So did I, 9 months ago. I then pelted him with a barrage of questions.
This is what I did: I placed them in a formerly occupied pipette tip dispenser, with its inner container inverted, allowing for 100+ holes to be faced down. I then mixed a combination of (washed) and & peat (mostly sand). I placed the gemmae on top and closed the hunged lid. For an example of what the container looks like, just click on my profile. To the left of the D. capensis is a purple dispenser container. I put them on a window sill and let them have at it. Within days the gemmae visibly sprouted. They looked like miniature green fists, with the fingers pointing upward. Gradually, I went from having them totally covered to opening during the day to totally keeping the lid open. Basically, the container is a glorified terrarium (with the lid closed). I didn't have them in standing water, but they were certainly kept moist by being covered (at first). After removal, I just made sure that they were kept "open tray". That would be the equivalent of your "standing water".
This method worked very well for me. All gemmae sprouted and none died, now 9 months later. I am sure others have modified success stories, so it isn't necessary to duplicate what I did. I work in a lab and those containers are a throwaway.
With gpigmy sundews, it is more important to allow for deep, more than wide. They have developed root systems that endure harsh, dry conditions in their native Australia and have adapted by forming stipules, summer dormancy, and long tap roots.