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I think it is sodium alginate.
I read a couple of threads on feeding of non-photosynthetic corals and sponges.
Your talking about the "extract of algae" I suppose? To be listed before algae means there's more of it then algae. It's not a good coral food what so ever other then being a carbon source. Reef Nutrition uses it to keep the feed in suspension. With Rn there is a very minuscule amount as the stuff is rather potent in terms of doing what it needs to do (keep stuff in suspension).

