I use organic ferts in my program. I use Naturesafe products primarily.
www.naturesafe.com
10-2-8 is my base fertilizer but they do have a 5-6-6 that would work It is 100% organic.
Another great starter fert for seed ins
There is alos nutrients plus which is an excellent choice! nutrientsplus.com
I also use theri blended ferts like 21-3-7 -- uflexx blended to boost nitrogen.
When I need orgainc starter fert i usually use bulb-tone from espoma -- 4-10-6. Espoma products are available at all the stores around here.