Live brineshrimps are saltwater organisms and less likely to carry diseases which affect freshwater fishes directly. However from experience if the brineshrimp are dead when fed, it may still cause internal bacterial infections. I also make it a point to make sure none of the water in the bag of brineshrimp gets into my tank.
Tubifex on the other hand are often found in polluted waters and often carry pathogens.
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