these nutes ok?

my plants are now 4 weeks old and i'm wondering if its a good time to go ahead and feed them... i havent given them anything beside what comes in the shultz soil, i did go out and buy some mg 24-8-16 today at the garden store, i talked to a friend of mine and says its worked great for him during veg... will it be ok to use this and ok to use it now? pics attached

just start at 1/4-1/2 strength and see how the plants react.

yeah i wouldn't go any more than 1/4 strength... you're plants are looking good as is so they don't need much of a boost...

Good advice above. Go slow, and try to get a bit of runoff with each watering...and let the pots dry out abit between waterings. Use the lift method.

Drink!