Has anyone fed urchin algae wafers designed for freshwater fish?

I have a sea urchin and many platelets algae algae eater in my freshwater tanks, I wondered if I could give hedgehogs

Most wafer freshwater algae are made of spirulina is blue-green algae. Unfortunately, one does not eat sea urchin blue-green algae in nature, you must obtain strips of nori (or the pet store or Asian market *** make sure the unflavored) HTH.

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