Bacillus bacteria or amino acid? U can have both. If you are open to the idea of silaging fish byproducts (maybe you can tap a marine processing company)....and ferment fish with carbohydrates source and lactobacillus starter..(its simple..you can have it in drums). The product is very high in amino acids and probiotics very good for the soil...also as foliar application..
Or you can purchase ready-to-use products.