Nutrients for semi-soil less mix

Help... I need some advice on where to start. I started my seeds in 1. 5 inch rockwool cubes and just transplanted
them into 5 inch pots. I am using a grow medium consisting of about
10% vermiculite 10% perlite 30% coco and 50% fox farms ocean forest soil. The
plants are about 3 weeks old and the second set of leaves are sprouting. I am looking for a feeding schedule and all that I am finding is geared towards hydro. I am interested in Advanced Nutrients because of the reviews. Thanks for your input.
 
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