I believe hikari is all enriched brine if that helps. I know its vitamin c enriched.
I use spirulina brine bc my tang eats it too
Ocean Nutrition has Brine Shrimp Plus, and their web site states: The brine shrimp is supplemented with a nutritious blend of seafood, plankton, natural algae and vitamins. Complete balanced nutrition for healthier and more colorful tropical fish. Contains stabilized Vitamin C and other immune boosters. Excellent for reef tank applications, including nano reef tanks.
Ingredients: Marine shrimp, brine shrimp, marine clams, squid, krill, fish hydrolysate, spinach, fish oil, green algae, astaxanthin, canthaxanthin, vitamins (choline chloride, ascorbic acid (stabilized Vitamin C), Vitamin E supplement, niacin, thiamin mononitrate, folic acid, calcium pantothenate, riboflavin, menadione sodium bisulfate complex, Vitamin A acetate, pyridoxine hydrochloride, Vitamin B12 supplement, Vitamin D3 supplement, biotin) and trace elements (manganese sulfate, zinc sulfate, copper sulfate, sodium selenite).
As you can see, there's a
LOT more than just brine shrimp. If I run across any of this, I might even give it a try.