The Fox Farms trio is what you'll want.
Grow Big (growth stage) and Tiger Bloom (flowering stage) have all the nutrients and micronutrients you'll need, the Big Bloom is a catalyst tea formulated to compliment the other two.

Here's the FF feeding schedule:
Fox Farms Weekly Feeding Schedule

Like Cigarettes42 said...The nutreints in the Ocean Forest should last a few weeks, but never add nutrients to a seedling till the appearance of 4 or 5 sets of true leaves.