Neptune's Harvest for veg

A buddy gave me some Neptunes Harvest fish fertilizer that is 2-4-1. I have two clones about two weeks in, just about to top. He swears to just add the fish fertilizer but I'm concerned it is more for flowering than vegging. I do want to use it for the organic and other added proteins, but not sure if I should find a different product for veg since the N is lower. Anyone have insight?
 
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