how long do i wait to give nutes

Hey guys, my seedlings just popped up out of the rockwool how long do I wait now to transplant into bigger rockwool and start nutes?

Rockwool can easily be oversaturated but you can start 1/8 strength nute or 1/16 if high NPK values.Some wait till roots show out of bottom of starter plugs but if sprout is healthy and not stretched(from too much light distance) then anytime for transplant.

I personally dont start giving plants any nutrient until they have their fourth node

dont start feeding nutes until your plant gets bigger. Like the guy above said, 4 or 5 nodes is a good place to start.

Things like B vitamins and Kelp are good to start with.
You can get a gallon of B vitamins at Home Depot for like 6 bucks... a lot cheaper than superthrive.
And Kelp based fertilizers have a lot of good stuff in them, too. google Ascophyllum Nodosum Seaweed