Now comes the hard part. Keeping them alive. I purchased some Pseudolithos migiurtinus seeds before finding the plant. I sowed them in an almost pure mineral mix on 12/9. Two out of six have sprouted so far. I have them in a small covered tray with bottom heat under T5's. How long should they be kept in high humidity? Should they be left in the tray until they start to crowd each other or should they be individually potted before then? Should I treat them they same as my huernia seedlings?

The seller recommended using a few cedar chips sprinkled on the potting medium as a fungicide (to prevent damping off). I'd never heard of using cedar chips. I normally use sulfur as a fungicide on mature plants but am afraid that might kill them.