Getting back into saltwater reef tanks, been close to 35 years. I did not make my own home made frozen fish food then, but plan on it this time around. I was just thinking if it was possible to pass on parasites from wild caught or farm raised shrimp, fish, and shellfish used to make the DIY frozen fish food. I know its been frozen, BUT, this may not kill parasites or their eggs. Most folks generally cook their store bought sea food they plan to eat so its can go unnoticed . There has to be a slight chance on introducing parasites to your tank this way, even when buying store bought frozen fish food.