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Maggots are an excellent high protein supplemental food. However, they do have higher fat levels than other foods, and should not be used as the primary food source for aquarium fish. Keep in mind that even though many fish enjoy maggots, not all fish will eat them.
Similarly one may ask, what human food can you feed a goldfish?
As well as flakes and pellets designed specifically for them, goldfish will eat peas (with the shells removed), boiled vegetables, bloodworms and brine shrimp. The above foods make a great change to flakes and pellets. You can read about other treats for your goldfish here!
Herein, can I feed my fish worms?
Yes! But freshwater fish love tubifex worms and thrive on them if they are cleaned properly. If the water is clear they are clean and can be used to feed your fish. Don't feed them to your fish until the water is clear, so continue to rinse them as needed.
Although goldfish will eat other types of lettuce, red leaf lettuce is easy for them to chew and unlikely to cause digestive problems. Rinse the lettuce in warm water then attach it to a lettuce-clip inside the tank. Cooked baby peas are an excellent addition to your goldfishes' diet.