>> (Many of the sprouts have white hairy mold on them, though. Suggestions?)
I think anything that gives you less humidity right where the seedling is would help.
This is what I can think of:
- a small fan or a draft
- remove any humidity dome
- water less
- bottom water if you aren't already
- water only with dilute hydrogen per5oxide (0.1%. Make from 3% drugstore H2O2: 1 ounce per quart)
- if you;re watering with soemthing organic, leave the organic stuff out until the seedlings are mkuch larger.