for their oto? It's by Ocean Nutrition and says it's good for freshwater herbivores (in addition to tall the saltwater fish they market it for.) My oto already get zucchini occasionally. However, they never get a shot at any of the algae wafers. The cory and platy attack those. So, I thought maybe a little bit of these sheets, clipped in like I add my zucchini, might be a good thing. However, I certainly don't want to give them anything that's not good for them. I just hesitate since it's mostly aimed at saltwater fish and I wonder if there could even be salt in the sheets since it's marine algae...