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I wouldn't suggest it... The beneficial nutritional value for most marine organisms could be low. For one, marine lipids are going to be quite different from those from a cow. Simply put, most marine fats are going to be unsaturated, those from a cow will be saturated. Even if there are some great benefits is it really worth risking using something we don't know much about just to save some money? The feeding Discus beef heart thing most likely started in the first place as a cheaper and safer alternative to tubifex and bloodworms.
In short, stick with something that's closer to a natural food source.
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