One thing to know about that starter system, other than the very small amount of growing medium per plant, is that you have to get all the plants out at once. You can't pop them out one-at-a-time. You'll find that tomato transplants are rarely ready all at the same time.
I'm guessing the Ferry Morse seed starting mix has a tiny bit of phosphorous in it for roots? If so, I don't know that you need ANY fertilizer at this stage. I would fertilize just once with 1/2 strength seaweed emulsion at the 4-5 true leaves stage (when the transplant is about 6-7" tall).
Because the growing space for each plant in your seed starting setup is so small (I am figuring 1" x 1" x 2.5"?), you will need to pot up to 4" pots or styrofoam cups (with a hole drilled in the bottom) once the plants are past their first true leaves.
I will always prefer slowly grown, healthy, stocky seedlings, than ones that grew more quickly.
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