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Beef heart is fairly low in fat, however, since it comes from a warm blooded animal-this type of fat is hard for fish to digest/process- especially at lower water temps....high water temps needed for the Betta to properly digest/process mammal fats also can shorten the Betta life span......
The type of fats and long term high water temps-both can adversely affect longevity.....
Long term high temp-speed metabolism and this in turn can shorten longevity in fish...water temp, metabolism, fats, digestion go hand in hand...if the temp is too low to properly digest the fat-it can adversely effect the fish-fatty liver disease, obesity, immunity, weakness, poor growth...etc.....fish(cold blooded) generally process/digest their foods in the 70-80F ranges-warm blooded animals process/digest food in the 85-100F range
Feed very, very small amounts by making a paste out of it and make a water change after feeding it since it will foul the water really fast.....
Personally, I wouldn't recommend feeding beef heart to Bettas.....
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