Plz help! How do I mix

I transplanted my lemon skunk from soil to hydro(5 gal bubble bucket) 2 days ago. I'm getting yellow spots on my leaves. How do I mix the grow big. It says 2 tsp per gal..so do I put 2 tsp in a gal.. Mix it up and then add to bucket..or do I add 2 tsp for every gal in bucket (around 6) any thoughts or advice?
 
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