Many fish are not carnivores and will not eat pods......most all SPS feed from nutriants produce thru photosythesis from light energy and minerals thru water absortion.....some SPS and many other types do benifit from micro( need a microscope to see it )fauna. Fauna is ALL animals present in an enviroment and many, many different types are present, hopefully, in healthy tanks...all like a food chain supporting each type from micro bacteria right up to large fish that are not microfauna but still fauna....some micro and macro fauna may not benifit pets for food but helps in filtering water and bio-load.....all good...