Very good. Is this your new soil that you are using? It sounds as if you are doing all that you can. Watch the plants with the light. While they do need it at this point due to their age, be sure that it is not so bright as to be causing them to wilt. Bright indirect is best. Give them more as they can tolerate it.
I see no reason to add anything else to the soil until you get some root growth. Your idea of the chamber sounds great. Heat from the bottom ought to help some.
There are no Tasty Tom tomatoes available in America unless we purchase them from the Netherlands and have them sent in.
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~ Patti ~
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