My little aquarium recently began to bloom algae like mad, so I got a couple of Ottos, who have been cleaning it up admirably. I want to give them some additional food, as they don't seem to notice the algae wafers I drop in. I bought a zucchini, but don't know how to prepare it. Several websites have suggested blanching it, but my pots have all been washed numerous times with soap, so I'm reluctant to boil something that may contaminate my tank. Does anyone know how to prepare fresh vegetables for introduction ito an aquarium?