Of all the sprouts, the Snow pea sprouts are the most prone to failing if you overwater them, especially in the early stages. So the three simple steps to make sure you don't do this are:-
After you have soaked the seeds and before you plant them, quickly run your hands through them and discard any soft or damaged ones, this reduces the chance of mold infecting the good seeds from a bad one that has begun to decay.
Only half fill the reservoir during the initial germination phase.
Pick the pot up with your hand and only add water when it begins to feel lite in weight.
Then only add enough water for that day, obviously you will need to increase the water once the plant grows taller and has more leaves, but again check the weight before you add water.