OK, but the bloodworms commonly sold as fish food are insect larvae. I did look up
Glycera dibranchiata because I am not up on my Latin and you are corrct they are marine worms. Those are not whats sold as bloodworms as far as I ever saw, but I could be wrong. I do know the dried ones are just insect larvae.
This is what I find when I look up frozen bloodworms on the net
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A favorite of both freshwater and saltwater fish alike, frozen bloodworms (red mosquito larvae) contain a variety of important vitamins and minerals This ideal primary food is great for loaches, discus, bettas, as well as saltwater angels, butterflyfish, damsels, and more Treat your fish to the taste and nutrition of all-natural bloodworms
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I do collect "real" bloodworms in salt water but they grow about 9" long and I have never found them frozen.