Don't complicate things. It's just a sprout, it doesn't even had leaves yet...
Seedlings/Sprouts are very easy to burn. The smallest amount of fertilizer could kill them. You don't wanna start adding nutes to a seedling until it has it's first set of TRUE leaves, and then only at 1/4 - 1/8 strength. If you want you can add a small amount of root booster like Roots Excellurator or SuperThrive, but only a few drop per liter for now.
I have trouble even telling you that cause I have a feeling your just looking for permission to over-do it. Remember KISS, keep it simple stoner. Seedlings need literally NOTHING for the first two weeks AT LEAST. Longer id your soil has slow release nutrients or is pre-amended with nutrients, organic or otherwise.