Growing them under a two tube fluorescent fixture is another good possibility. They are allowed to approach dryness but not completely dry out. It has been not necessary using this technique to do any sort of fungicidal spraying. The flasklings establish very quickly and grow vigorously, gaining a 3 to 6 month head start over flasklings potted out with the agar removed. Fahrenheit would be ideal.
Bottom heat is preferable.
We have used this procedure for approximately 1500 flasks now, and have found it to be the easiest and most successful technique for compotting we have tried. It virtually has eliminated the need for any post compotting fungicides, and seems to give the seedlings a quick and vigorous start. We have recommended the procedure to several other growers with varying conditions, and the feedback has been unanimously and enthusiastically favorable. This technique appears to allow the plants to acclimate to the harsher conditions outside the flask while still deriving some nutrition and protection from the agar. We have been able to use it to rescue flasks that contaminated when the seedlings would have been too small to save using the normal procedure.