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HI this is DRB. If your goldfish is dying then the best thing to do is to end his life peacefully. The best way to do this with a fish is to fill a large ziplock bag full of water and put the fish in it. This way your fish can still get oxygen by being in the water.Then place the bag in the freezer in such a way that fish will still be immersed in the water. This will gradually cause hypothermia and death and is a kind way to end a fish's life. I hope this helps you but please let me know if you need additional help or have other questions. Sincerely, DRB
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