Welcome to RIUwell um first of all nutes arent used till a later stage likle 30days in i would say and you apply them when watering fertilizer someone els will have to answer because im not a expert at that good luck growing btw if you would like i can help you out with whatever you need send me a friend request by clicking on my name and adding contact and then say add friend
Welcome to RIU
Standard canned answer of no nutes for 30 days if your using time released nutrient laced soil...BUT, your growing in perlite, you need to start a very mild nute solution about 4-5 days after the seedling breaks thru. I would say 2-300ppm or 1/4 strength. You can use many different types of nutes and I ask that you search around the different brands....Advanced nutrients, fox farms, humboldt, flora nova, GH and on and on and on.
Are you following the "hempy" method and drilling a small hole 2" from the bottom of the container?