I do not rinse it, but I also like making my own frozen food.

The last large aquarium I had I started making my own flat packs. I bought various fresh seafood from HEB.

Shrimp, clam, squid etc. Shell it, clean and blend with fresh garlic and a little of your tanks saltwater. Throw it into a large freezer bag and make a flat pack. Easy.

My fish loved it and I saved cash. I did not mind the little extra time I spend preparing. Felt like if I love the tank this much why not.