Do my plants need extra nutrients

I have my plants set in Pro-Mix Organic Vegetable & Herb Mix. They seemed to be doing great. The past week I have put them on the 12-12 schedule. My question is do I need to add extra nutrients to the soil? My neighbor told me she uses the Botanicare Pure Blend Pro Bloom Soil Formula 1-4-5. Any help would be greatly appreciated. My first time growing. Thanks

You’ll likely need more nitrogen than that.