When should I add superthrive?

I transplanted all seven of my plants yesterday and watered them with just plain water, so I was wondering when I should add superthrive. The plants are a little over two weeks old from seed and are fairly small (inadequate/not enough lighting for the first week or so). Would it be okay to use the superthrive next time I water? Thanks in advance!

After one month should be fine just add 2X the amount of water it saids on the bottle and see how it affects the plants and keep it under 300PPM

Hope this helps

Thanks for the help, Mega!