Do I need any other nutrients? Currently “Down to Earth Vegan Mix Fertilizer 3-2-2”

So I’ve started 2 plants as a hobby and in a 0.5 gal pot, they’re about 3 weeks old and I’m going to be introducing fertilizers soon maybe in 2 weeks depending on how they do. The soil I’m using is Mother Earth groundswell.

so to my story, the guy at the hydro shop told me to use vegan mix 3-2-2 fertilizer and that can use only that for my whole grow.

thing is, I’m skeptical that I only need one fertilizer mix? I’m thinking about grabbing some cal mag and fox farm trio to feed them but I want to be sure.

can I use the vegan mix for my whole grow or do you guys recommend grabbing the nutrients I need? I only have two plants in an indoor micro grow setup inside a pc case as a hobby, thanks guys.

That looks very similar to Gaia Green/UCANN where you plant your plants into a fortified soil then top dress the soil with their organic mix and water it it. You can probably use hte 3-2-2 all the way but would have to add a phosphorous source later on. The hydro shop should be able to give you more info.