Saying they can only digest seafood is false but maybe a seafood diet is better than a mammal based diet but as a treat
Reason most people dont is exactly that mammalian protein is just not good for fish. Yes, they eat mammals in the wild but they will also eat anything alive in the water they can fit in their mouths. Reptiles, birds etc.
Ive never done it, but imagine how dirty your tank would be after something toothy was done with it. I dont want mouse blood in my tank, or fur, or fish to cough up a nasty half digested mammal. Ammonia spike of the century
Wanna feed something neat and healthy? Frogs are a good choice
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