Magnesium is the first deficiency to show among the minor elements, for me anyway, but not usually until heavy fruiting. At this point, I doubt your seedlings need any of the calmag. If it were me, I would wait until the plant was much bigger and started showing the first signs of deficiency, then use a soluable product at that time. There is liquid cal-mag, and many people use epsom salt.
I like to use as little fertilizer as possible on young plants. Using too much can make things go wrong in many different ways, by locking out other nutrients, throwing off ph, or causing a bacterial imbalance in your soil.
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